try this
https://www.microsoft.com/en-us/download/details.aspx?id=30135
you can also search the web for other troubleshooting suggestions
or for
further troubleshooting steps will have to come from support
another idea is to uninstall 4.8. reboot. disable virus software temporarily. try to reinstall TT 2019
then you can upgrade to 4.8. don't remove 4.5.2.
I have the same issue. I tried NetFixRepairTool, I tried uninstall/install .Net, I tried almost everything people suggested, and two PC machines. It still give me the same error about .Net 4.5.2.
Friends,
Don't bother wasting time trying to "fix" this by re-installing .NET, etc. this is a very old BUG in their software, it will report that regardless on many systems that are perfectly fine, see this thread:
with a very simple workaround that bypasses that bug. As expected, they will not fix nor reply/admit
Good luck.
Nova.