[Solved] Opera (Portable) - Installed Version not detected
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 Opera Portable (from PortableApps.com) is found on my system in the following folder: - D:\PortableApps\PortableApps\OperaPortable\App\Opera\53.0.2907.68\opera.exe
 Errors: - The installed version is not detected (the text Unknown is shown)
 Notes: - In the Windows 10 Settings the portable application Opera is not listed in the list of installed applications.
 
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 Cool, the version number is now detected correctly! 
 So the issue is solved.
