I just looked quickly. I see two major problems.

• window.performance isn't supported. They use window.performance.timing for example.

• They make use of the 'let' keyword in Javascript.

You might be able to fake the first one with User JS, but I don't know what you can do about the second one. I thought adding 'use strict'; at the top of a script added support a few EcmaScript things in Opera 12, but I don't really remember. It doesn't help for the 'let' keyword though. I would imagine that you'd have to use proxomitron with Opera to change that to 'var'. Or, maybe you can intercept the script with UserJS and rewrite its content to use 'var' instead of 'let'. Don't know.

There might be other errors too, but those are the 2 I saw.

You'd probably have to change Opera's UA string too.

Another option might be to look at the form they use to submit and try to submit directly to the server script with your own HTML page. But, their login security might prevent that with tokens or something.

Opera Developer has USB devices in settings. It might work there. I'm not sure if Opera supports the UI to allow/deny when a site asks though.

@cesaraquino Awesome and thanks for the clarification!

You need to associate uTorrent with the magnet protocol in Default Programs/Apps in Windows. I'm not sure if it'll be available as an option for uTorrent Portable though. You might have to install the regular version.

To test that it's working, open up a command prompt and run this command:

start "test"  "the magnet link"

If it opens uTorrent and starts the download etc., it's working fine. Then, it should work in Opera as long as the magnet link is in a web page and you click on it. As it, the links probably won't work if you paste them into the address field.

@cesaraquino Glad you got it working. Could you rephrase that though? Are you saying that before, you installed the Creators Update first and then upgraded to the Fall Creators update, and this time you just installed the Fall Creators Update directly/fresh?

Since Opera is based on Chromium like Chrome, you can search the net for this issue in Chrome.

https://www.google.com/search?q=chrome+windows+10+creators+update+connection+slow

https://productforums.google.com/forum/#!topic/chrome/MOKEjJbPmKg

http://www.surfacetablethelp.com/2017/05/edgechrome-resolving-host-and-slow-network-in-windows-10-creators-update.html

@cesaraquino said in The latest versions of Opera do not work on Windows 10 Creators Update:

@burnout426 I just did and it's not working. And I realize it doesn't work with Vivaldi either, it only works from Firefox. I don't understand.

Firefox uses its own network stack instead of the system's. Chromium browsers like Chrome, Opera and Vivaldi use the system's. IE and Edge should use the system's too. That points towards something in Windows being the issue.

Open "C:\Windows\System32\drivers\etc\HOSTS" in a text editor. What's it look like?

In "Control Panel\Network and Internet\Network Connections" (as in, "Start -> Settings -> Network and Internet -> the connect you're using -> change adapter settings"), right-click on the adapter you're using and goto "properties". In the properties on the Network tab, check the properties for both IPv4 and IPv6 and make sure IP address and DNS are set to "automatically". If they are, you could try some free DNS servers listed at https://www.lifewire.com/free-and-public-dns-servers-2626062 to see if that makes any difference. You could also test to see if it's a DNS issue by getting the IP addresses of some sites and entering them into Opera's address field to see how fast the pages load that way.

In internet options in the control panel, on the connections tab, in addition to unchecking "automatically detect settings", make sure "use a proxy server" isn't set if you didn't already check that part.

You could try AdwCleaner and Malwarebytes to see if they find anything.

Although you shouldn't have to, you could defrag your hard drive. WinXP had an issue sometimes where after a service pack update, all the network stuff would take forever to load on startup, where a defrag would fix it. Not exactly the same thing, but something you could try if not using an SSD. You could uninstall and reinstall your drivers for your wifi card or LAN card. You could try to find newer drivers too. But, not sure how much that'd since Firefox works fine. But, you can try.

You could use CrystalDiskInfo to make sure your hard drive isn't failing and possibly corrupting things.

You could reset the firewall settings if you didn't already.

I assume you've shut your system all the way down and started it back up again just for good measure?

Download the Opera installer, launch it, click "options", set "install path" to a folder on your desktop, set "install for" to "standalone installation" and install. Test in that Opera to see how things work. Don't enable Opera Sync or anything in that Opera. Does it work fine there? If not, try with other browsers like Chrome, IE and Vivaldi.

That could tell you whether it's just a messed-up Opera profile or just Opera itself or something messed up with your system.

If absolutely necessary, there's a way to install the newest build of Windows 10 fresh instead of doing an upgrade. That way you're starting completely fresh. If that's something you're up to trying, we can post links.

First, make sure the steam protocol is associated with Steam in Windows. Load up a command prompt and test it with:

start "test" "steam://connect/stuff"

If that works, test in Chrome to make sure it works there too. Then, in Opera, goto opera://settings/handlers and make sure steam isn't listed there. If it is, remove it. Then, test in Opera. If it doesn't work there, download the Opera installer, launch it, click "options", set "install path" to a folder on your desktop, set "install for" to "standalone installation" and install. Test in that Opera. If it doesn't work there, it sounds like an Opera bug (or the protocol is just blocked by Opera). If it does work there, there's something messed up in your normal Opera profile (setting/corruption).

Then, we can go from there.

Go to https://extensions.openoffice.org/en/project/czech-dictionary-pack-ceske-slovniky-cs-cz and download the extension. You'll get dict-cs-2.0.oxt. Rename it to cs.zip and put it in the "dictionaries" folder in Opera Mail's profile folder. Then, start Opera Mail (or restart Opera Mail) and it should be available for selection and use.