Deleting old PL files

I’m doing a drive clean up. I have different versions of PhotoLab dating back to PL2. Is there an interaction between them; do they share files? If I delete one version, will it effect others?

No, each version is independent.
When a new major version is installed, it creates its own files from the settings of the old one.
To be more sure you can make a backup of the database before.

Thanks, Frankie. I lost the Google NIK software to an early PL install. Didn’t want it to disappear again.