Hello,
First of all, thank you for your purchase.
This seems to be a server config related issue.
So, to resolve this issue, I suggest you to contact you hosting support and ask them the following: they should check if your host has any mod_security settings that forbids sending of URL as POST parameters, or any other rule, that could forbid this to happen. If they find such a rule, ask them to remove it. Also, you could describe the issue you are having to them, maybe they know how to fix it. To describe your issue, you can tell them the following: “When I try to activate a WordPress plugin, I get a 403 forbidden error.”
If they do not find any such rule, maybe this behavior is because of another plugin you have installed on your WordPress installation, but let’s hope for now that contacting the hosting support team will solve this issue.
Hope this is solved soon.
Regards,
Szabi – CodeRevolution.