is there a link to an article about it?

I tried it again on a different pc. It's windows 10 this time.
Same error... (latest installer from the FTP)

yes i did

The installation works in the VM, but i used a virtualbox shared folder to move it onto my system, the exe becomes ownerless as soon as its on my system...

So when i try and copy it over, the opera.exe file becomes ownerless and 0-byte.

I'm going to try and install the standalone USB version in a VM with tiny7, if that doesnt work i dont know what to do...

New user installation doesnt work for all users, or the usb option. It doesnt show up in programs and features because it never finishes installing.
Clearing the temp files did not work either. Im honestly confused why this is not working.
And i dont have an antivirus to interfere with it.

I just tried the FTP latest installer and one version back, and they both have the same issue. Installing for all users does not work either

It looks like the log got further.
Here's the log of the all users install:

[1028/085915.122:INFO:installer_main.cc(408)] Opera GX installer starting - version 71.0.3770.287 Stable
[1028/085915.122:INFO:installer_main.cc(411)] Command line: "C:\Users\Pa Cyber\Other\Opera_GX_71.0.3770.287_Setup_x64.exe"
[1028/085915.122:INFO:installer_main.cc(435)] Uninstall:0
[1028/085915.122:INFO:installer_main.cc(436)] Silent:0
[1028/085915.122:INFO:installer_main.cc(437)] Run Immediately0
[1028/085915.122:INFO:installer_main.cc(439)] Backend0
[1028/085915.122:INFO:installer_main.cc(440)] Inside package0
[1028/085915.122:INFO:installer_main.cc(441)] Autoupdate:0
[1028/085915.125:INFO:payload_manager_impl.cc(78)] Reading Payload
[1028/085915.126:INFO:installer_main.cc(561)] Found full package
[1028/085915.130:INFO:settings_impl.cc(629)] Found 3 paths for standalone install mode.
[1028/085915.130:INFO:resource_l10n_handler.cc(112)] Language not in the available languages list: 
[1028/085915.130:INFO:resource_l10n_handler.cc(118)] Trying language from system preferred list: en-US
[1028/085915.130:INFO:resource_l10n_handler.cc(161)] Retrying after adjustments: en-US
[1028/085915.130:INFO:resource_l10n_handler.cc(118)] Trying language from system preferred list: en
[1028/085924.034:INFO:scoped_download_folder.cc(59)] Installer download folder: C:\Users\PACYBE~1\AppData\Local\Temp\.opera\Opera GX Installer Temp
[1028/085924.034:INFO:installer_ui_lock_impl.cc(27)] Getting installer UI mutex
[1028/085924.034:INFO:settings_impl.cc(1105)] Install folder set: C:\Users\Pa Cyber\AppData\Local\Programs\Opera GX
[1028/085924.034:INFO:settings_impl.cc(1163)] Operation: 1
[1028/085924.034:INFO:installer_ui_controller.cc(290)] Initializing installer UI
[1028/085924.622:INFO:wininet_impl.cc(704)] Stopping the download
[1028/085924.622:INFO:package_fetch_sequencer_impl.cc(144)] Starting the package fetcher
[1028/085924.622:INFO:wininet_impl.cc(309)] Starting download from https://autoupdate.geo.opera.com/geolocation/
[1028/085924.623:INFO:payload_manager_impl.cc(182)] Writing payload to fileC:\Users\PACYBE~1\AppData\Local\Temp\.opera\Opera GX Installer Temp\opera_package_202010280859241\opera_package
[1028/085925.324:INFO:wininet_impl.cc(561)] Initial request completion
[1028/085925.324:INFO:wininet_impl.cc(585)] Could not get Content-Length from response: Error (0x13D) while retrieving error. (0x2F76)
[1028/085925.325:INFO:wininet_impl.cc(822)] Download completed
[1028/085932.054:INFO:settings_impl.cc(1105)] Install folder set: C:\Program Files\Opera GX
[1028/085932.054:INFO:settings_impl.cc(1163)] Operation: 1
[1028/085935.146:INFO:installer_ui_controller.cc(472)] Accept clicked.
[1028/085935.146:INFO:main_process_installer_runner_impl.cc(67)] Beginning installation
[1028/085935.146:INFO:main_process_installer_runner_impl.cc(190)] launching installer backend: "C:\Users\Pa Cyber\Other\Opera_GX_71.0.3770.287_Setup_x64.exe" --backend --install --import-browser-data=0 --enable-stats=1 --enable-installer-stats=1 --launchopera=1 --installfolder="C:\Program Files\Opera GX" --profile-folder --language=en --singleprofile=0 --copyonly=0 --allusers=1 --setdefaultbrowser=0 --pintotaskbar=1 --pin-additional-shortcuts=1 --server-tracking-data=server_tracking_data --initial-pid=6392 --package-dir-prefix="C:\Users\PACYBE~1\AppData\Local\Temp\.opera\Opera GX Installer Temp\opera_package_20201028085924" --session-guid=19439124-26f4-4589-8b1d-0370f82e46e5 --desktopshortcut=1 --wait-for-package --initial-proc-handle=DC05000000000000
[1028/085943.164:INFO:package_fetch_sequencer_impl.cc(376)] Package ready.
[1028/085943.164:INFO:pref_default_overrides_fetcher.cc(120)] Fetching default prefs overrides to C:\Users\PACYBE~1\AppData\Local\Temp\.opera\Opera GX Installer Temp\opera_package_202010280859241\pref_default_overrides with tracking data 
[1028/085943.164:INFO:wininet_impl.cc(309)] Starting download from https://autoupdate.geo.opera.com/api/prefs/?product=Opera GX&version=71.0.3770.287
[1028/085943.164:INFO:wininet_impl.cc(309)] Starting download from https://features.opera-api.com/api/v1/features?country=US&language=en&uuid=7bb1a66e-aa46-485b-856c-8c9b5c42011c&product=gx&channel=Stable&version=71.0.3770.287
[1028/085943.217:INFO:wininet_impl.cc(561)] Initial request completion
[1028/085943.217:INFO:wininet_impl.cc(585)] Could not get Content-Length from response: Error (0x13D) while retrieving error. (0x2F76)
[1028/085943.217:INFO:wininet_impl.cc(822)] Download completed
[1028/085943.217:INFO:pref_default_overrides_fetcher.cc(68)] Default prefs overrides fetched successfully
[1028/085943.499:INFO:wininet_impl.cc(561)] Initial request completion
[1028/085943.502:INFO:wininet_impl.cc(822)] Download completed
[1028/085943.519:INFO:main_process_installer_runner_impl.cc(262)] Informing the installer backend that the package is ready
[1028/085952.239:ERROR:installer_controller.cc(303)] Installer error: Unpack archive operation failed
Could not lzma unpack, error code: 7
Cannot unpack the installer
[1028/085952.239:INFO:main_process_installer_runner_impl.cc(232)] Stopping installer backend (if running)
[1028/085952.352:INFO:installer_ui_controller.cc(340)] Handling pending error
[1028/085952.352:INFO:root_screen.cc(223)] Displaying error: "An error occurred while attempting to install Opera!" and don't offer full package
[1028/085956.704:INFO:installer_controller.cc(114)] Terminating the controller
[1028/085956.704:INFO:wininet_impl.cc(704)] Stopping the download
[1028/085956.704:INFO:main_process_installer_runner_impl.cc(232)] Stopping installer backend (if running)
[1028/085957.031:INFO:main_process_installer_runner_impl.cc(232)] Stopping installer backend (if running)
[1028/085957.032:INFO:package_fetch_sequencer_impl.cc(85)] Terminating the package fetcher
[1028/085957.032:INFO:wininet_impl.cc(704)] Stopping the download

I also found the log file:

[1027/220617.669:INFO:installer_main.cc(408)] Opera GX installer starting - version 71.0.3770.302 Stable
[1027/220617.669:INFO:installer_main.cc(411)] Command line: "C:\Users\Pa Cyber\Other\Opera_GX_71.0.3770.302_Setup_x64.exe"
[1027/220617.669:INFO:installer_main.cc(435)] Uninstall:0
[1027/220617.669:INFO:installer_main.cc(436)] Silent:0
[1027/220617.669:INFO:installer_main.cc(437)] Run Immediately0
[1027/220617.669:INFO:installer_main.cc(439)] Backend0
[1027/220617.669:INFO:installer_main.cc(440)] Inside package0
[1027/220617.669:INFO:installer_main.cc(441)] Autoupdate:0
[1027/220617.669:INFO:payload_manager_impl.cc(78)] Reading Payload
[1027/220617.674:INFO:installer_main.cc(561)] Found full package
[1027/220617.679:INFO:settings_impl.cc(629)] Found 3 paths for standalone install mode.
[1027/220617.679:INFO:resource_l10n_handler.cc(112)] Language not in the available languages list: 
[1027/220617.679:INFO:resource_l10n_handler.cc(118)] Trying language from system preferred list: en-US
[1027/220617.679:INFO:resource_l10n_handler.cc(161)] Retrying after adjustments: en-US
[1027/220617.679:INFO:resource_l10n_handler.cc(118)] Trying language from system preferred list: en
[1027/220625.806:INFO:scoped_download_folder.cc(59)] Installer download folder: C:\Users\PACYBE~1\AppData\Local\Temp\.opera\Opera GX Installer Temp
[1027/220625.806:INFO:installer_ui_lock_impl.cc(27)] Getting installer UI mutex
[1027/220625.811:INFO:settings_impl.cc(1105)] Install folder set: C:\Users\Pa Cyber\AppData\Local\Programs\Opera GX
[1027/220625.811:INFO:settings_impl.cc(1163)] Operation: 1
[1027/220625.811:INFO:installer_ui_controller.cc(290)] Initializing installer UI
[1027/220626.133:INFO:wininet_impl.cc(704)] Stopping the download
[1027/220626.133:INFO:package_fetch_sequencer_impl.cc(144)] Starting the package fetcher
[1027/220626.133:INFO:payload_manager_impl.cc(182)] Writing payload to fileC:\Users\PACYBE~1\AppData\Local\Temp\.opera\Opera GX Installer Temp\opera_package_202010272206251\opera_package
[1027/220626.138:INFO:wininet_impl.cc(309)] Starting download from https://autoupdate.geo.opera.com/geolocation/
[1027/220626.796:INFO:wininet_impl.cc(561)] Initial request completion
[1027/220626.796:INFO:wininet_impl.cc(585)] Could not get Content-Length from response: Error (0x13D) while retrieving error. (0x2F76)
[1027/220626.796:INFO:wininet_impl.cc(822)] Download completed
[1027/220632.446:INFO:installer_controller.cc(114)] Terminating the controller
[1027/220632.446:INFO:wininet_impl.cc(704)] Stopping the download
[1027/220632.446:INFO:main_process_installer_runner_impl.cc(232)] Stopping installer backend (if running)
[1027/220633.000:INFO:main_process_installer_runner_impl.cc(232)] Stopping installer backend (if running)
[1027/220639.805:WARNING:stat_sender_impl.cc(318)] Attempting to send a message after sender finished
[1027/220642.059:WARNING:stat_sender_impl.cc(318)] Attempting to send a message after sender finished
[1027/220642.060:INFO:package_fetch_sequencer_impl.cc(376)] Package ready.
[1027/220642.060:WARNING:stat_sender_impl.cc(318)] Attempting to send a message after sender finished
[1027/220642.060:INFO:package_fetch_sequencer_impl.cc(85)] Terminating the package fetcher
[1027/220642.061:INFO:wininet_impl.cc(704)] Stopping the download

I also managed to record me using the offline installer with the error message. Here is the video: https://streamable.com/rsf4gj
Ignore the poor editing

I forgot to mention I have Windows 7.

I did reboot twice, and the files were still there. I also ran a chkdsk and tried multiple tools to take ownership of the file, to no avail.

I tried the portableapps.com portable installer, the official website installer as portable, and not as portable. All of them had the same error with the ownerless file.

I ended up rolling back my PC to remove the files, but I would still like to be able to use the browser.