@leocg Windows 10 Home.

I am also experiencing the same issue, even after uninstalling Opera (including my personal data) and installing the latest version of the Opera installer file from the opera.com.

Any idea what's wrong? The browser still works but this "fatal error" window pops up every time I open the Opera browser.

"Opera installer 106.0.4998.28.0

Fata error upon loading installer executable:
In line 199:Data error (cyclic redundancy check)., In line 264:The operation completed successfully., In line 295:The operation completed successfully., In line199:Data error (cyclic redundancy check)., In line 264:The operation completed successfully., In line 299:The operation completed successfully., In line 169:The specified procedure could not be found.,

When reporting this error, click on this text and press Ctrl+C to copy it."