.NEt Framework 3.5 problem with x5 Pro 12 
Autor: Paul D.
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While trying to install x5 Professional 12, it tells me I need .NET Framework 3.5
I have followed all instructions and still can't get it to work. Please help ASAP. I have lost at least a full mornings work trying to upgrade! Not a happy camper!
Thanks
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Hello Paul,
Can you please tell me which windows you are using?
Which instructions did you follow?
you get always the same error?
Try to use this repair tool:
https://www.microsoft.com/en-us/download/details.aspx?id=30135
Many thanks!
try to install from microsoft site latest .net framework
restart
install again x5
after that should eork fine