Loss of wp-admin?

Hello
I hope you are well and good?

I have used this plugin on my old website and I loved it! I have been trying (for a few months) to install it on my current website but I have no luck.

Every time I install the plugin and activate it. I lost access to wp-admin on my website.

So the plugin installs, I then click Actorvate and the page just keeps loading, After a while, I refresh the page and its goes blank. If I try to got to /wp-admin its blank and all other admin links are the same. But if i go to the main site it loads.

I have to login into cPanel and delete the installed flies from the plugins folder.

I have tried a few older versions of this plugin but all do the same.
I have removed all other plugins and still have the same issue.

Any idea on what could be the problem?
The website I am installing it on is: https://www.northwest-security.co.uk