What I find really annoying, is the fact that the same Product ID is used for both versions. So when you check your plugin versions for updates, the 3.7/3.8 modification says 7.80 is available which is not the case.
I suggest that you change the pid to be something like this. For both version.
https://vborg.vbsupport.ru/misc.php?...=post_thanks3x
https://vborg.vbsupport.ru/misc.php?...=post_thanks4x
Why? Because now I can't tell when you update version 3x of your module for security updates.