Prohibiting user registration in multiple groups

Hi!
Is there a mechanism to prohibit recording to the same event of a user who has already been recorded as part of another group?
The current check "Prevent Duplicate Registration" checks only the registrar himself by email.

Hello

I just updated code to handle this case. Please access to My Downloads menu item, download latest package of the extension, upgrade it to your site and check it again. It should work exactly as you mentioned

Regards,

Tuan

The fact is that I have made quite a few edits to the php code in different places and now, accordingly, I cannot update the version without losing my changes
Can you tell me what and where to change in the code so that I would do it myself?

We need to validate your order before providing further support. Could you please submit a support ticket let us know the email you used to purchase the product or PayPal Transaction ID of the purchase so that I can verify your order?

Tuan