Pixinsight License File Location !link!

Opening the license file in a text editor will reveal some structure, but modifying even a single character will corrupt the file, causing PixInsight to fail the validation check upon startup. If you suspect the file is corrupt, it is usually best to delete it and re-run the licensing process.

On Linux systems, the license file is stored in your home directory within a hidden .Pleiades folder. pixinsight license file location

If you find a license file here, you can keep it, but modern PixInsight versions prioritize the AppData\Roaming location. Opening the license file in a text editor

~/Library/Pleiades/PixInsight/