Management of licenses can lead to Windows adding a .txt extension to the filename.
Sometimes, Windows wants to be clever and notices that the attached license file that you received from us is plain text, and when saving this attachment, it appends the extension .txt to the filename.
Solution
Please make sure that all license files in the license file directory have the file suffix ".lic" – also check option “hide/show known suffixes” when using Windows file explorer, oftentimes files may have the suffix ".lic.txt" although only ".lic" will be displayed.