Plugins installation and activation issue

Hi Guys,
I recently purchased a WordPress Theme, I had problem installing it into my Windows based Shared Plesk Server. It was giving me 500 Internal Server Error. somehow by the help of my service provider the problem is solved and I successfully installed the Theme. but when I was installing the Plugins, it gave me really hard time installing and still I could not install and activate the Plugins from last four days I am trying and I get problems. the cursor just scrolls and after a while says installation failed.
Please if anyone can help and assist me to resolve this issue.

thank you


Contact with your purchase item author hope they will helped!