It's too bad you uninstalled the older version of Cura. Unlike most software with different versions, Cura installs as though it is a completely different app for each version so I have about 8 versions installed and can easily run whichever version I want. Although I usually only run a recent version.
So are you saying that when you open the STL file generated from fusion, Cura crashes? Or hangs up? Make sure all copies of Cura are closed and that there is no hung up version of Cura somewhere (on windows you need task manager to determine this). Then start it fresh and try loading a very very simple STL from tingiverse - perhaps a cube?
Then clear platform and try loading your fusion STL file. Perhaps you have too many triangles? There is a limit - not sure if the limit is 2 million polygons, 200 million polygons, or what. But at some point cura runs out of it's limited memory so that is my guess as to the problem. If that's the problem you might decide to decimate the number of polygons using meshlab (try googling how to do that). I have found that 1 million polygons can describe pretty much anything you might print in the volume of the UM to the resolution of the UM.
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Labern 775
Do you have a file that we can try?
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