I need to test a computer with no internet connection

I have a machine that was subject to a ransoomware attack.

I purchased pro plus. It will not install.

Server 2012R2
Logged in as Administrator
No Internet access

Unable to attach error log

I don’t see a question.
More information will be needed for anyone to attempt to assist.
What Pro plus ???
What OS?
version? build 32/64 Bit
And Any other Security Software installed for a start