Hello Guys,
This is what you need to do to fix this issue: https://support.microsoft.com/en-gb/help/4020302/the-net-framework-4-7-installation-is-blocked-on-windows-7-windows-ser
Just download the necessary Windows update for your systems (32/64bit) and start your SOLUS 3 agent after the update installed. it should fix the issue and you can use .NET 4.7 with your SIMS/SOLUS 3 installations.
Cheers!