Yup, probably a false positive
@Lze Go to the protection > Antivirus > Advanced and temporarily disable "bitdefender shield". Then reinstall (its easier than messing with the quarantined objects. Then open the GUI and go to Antivirus > Settings > Manage exceptions. Click add exception and under path set (assuming x64 windows) "c:\program files\ultimaker cura 5.0.0\ultimaker-cura.exe". Flip the 1st switch (antivirus) > and i enabled all 3 checkboxes, then flip the third one (advanced threat defense". Click OK. At least that should for the moment let it start up.
I'll wait myself on using it, until there's more plugin support and this issue is fixed.