Hello, I just donated for the plugin for a customer site using my own account, should I uninstall the plugin and install it again using my email to be able to register it?
Thanks in advance
No, because reinstalling the plugin does not affect the registration. All you need to do is to click on the green checkbox in the upper-right corner of the Anti-Malware Settings page in the wp-admin of that site. Then change the email address on the registration form and re-submit the registration under your email.