Unable to re-install Membership Pro 2

Constant errors today with the plugin. Finally removed the installation and tried to reinstall.
Getting 'Error' on the 'install' button. Then "Something went wrong with plugin activation".

I'm not seeing anything in our CGI error log. Our website has been up and down for over a week now. Our customer base is furious right now. We are at a loss as to what to tell them...

Please advise asap.

Many thanks again.