[Plugin: WP-Member] a fraud ?? / crash down my website after activated

Hello world, first time here ??

I tried this plugin from SmartMediaPro (50$). After a good install and a good use, I saw that some custom formular features was not present than I expect. I contacted them to refound my purchase. But after many support tickets, i still have 0 answers from them after one month, and it is impossible to call them… nice.

Did you heard something about this company and plugin ?

After a week, I tried to reinstall and reactivate the plugin for further test but big probleme: When activated, all my domaine have a 500 error. Impossible to use it or to connecte to my dashboard. One succefull thing was to delete the plugin folder on the FTP. I tried many other install / activation, same problem. Only this plugin dammage my website,

Did some one now how it could happen ?

Thnak you in advance