Hello,
First of all, thank you for your purchase.
Error 502 is a server configuration issue, which points that you have multiple servers set up in a chain and one is having issues while running the plugin.
There can be multiple reasons for which this can appear. Are you using LiteSpeed servers? Are you using any server side caching? Or are you using CloudFlare?
To try to solve this issue, I suggest you go to the plugin’s ‘Main Settings’ menu and check the ‘Do Not Check Generated Posts In Rule Settings‘ checkbox -> save settings. Let me know if this helped.
Regards, Szabi – CodeRevolution.