Microsoft .NET Framework 3.5 is a software framework and a set of libraries used by the VSA and some add-on products. If not already installed, Kaseya Server Setup will install it for you. Click the Fix it link next to this missing prerequisite to have Kaseya Server Setup fix it for you.
To Manually Install DotNet Framework 3.5 in 2008 R2
DotNet Framework 3.5 is enabled as a feature in 2008 R2. To enable this feature:
\Windows\Microsoft.NET\Framework
directory.