How can i block system.exe with the new version?

I am in a situation where i need to block various instances of system.exe, svchost.exe, and explorer.exe, but without the block button i don’t know how to do this any more.

I have had to block svchost and explorer from accessing the internet completely, but with the System file i can’t even do that, as for some reason I can’t type its path when i add a new application to block, i can only browse and i can’t browse for “System” as the path.

Is there any way i can block system.exe or downgrade to the previous version of comodo?