Dear colleagues

I am going to deploy dotnet framework in our company. For this I need to do
a risk assessment of dotnet framework. Thus I have following question:

Is there an available risk assessment of  dotnet framework?

Is there a document which describes what  and where exactly is installed
dotnet framework? Which system files are replaced etc.?

Is there a document which describes how dotnet framework versions are
handled? E.g. if I install a version 1.1 how is affected version 1.0 etc..

Looking forward for some hints.

Thanks in advanced .
Alex