When I try to install Enviro Spase I get the error shown below.

Newer versions of Windows do not include aversion of .NET, that is backwards compatible with .NET 3.5. As a result they will not work with Enviro Spase. To correct this, click No and then go to Download .NET Framework 3.5. . Once on that page, download and install the version needed by clicking on the link for Download .NET Framework 3.5 SP1 Runtime.Once downloaded, you will need to install it.
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