wonwinglo

I need to download Microsoft.net.Framework V1.1, in preparation for istalling some more specialised software for a SBS-1 Mode-S Transponder aircraft tracking system.
I have downloaded the zip file to my computer,however when I try and open it,the following legend appears ?

'The upgrade patch cannot be installed by the Windows installer service because the program to be upgraded may be missing,or the upgrade patch may update a different version of the program.
Verify that the program to be upgraded exists on your computer and that you have the correct upgrade patch'

There are all upgrades including SP.1 & 2 installed,so what could the problem be ?
Thnk you for any advice.

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