I have Delphi XE2 and Rio 10.3.2. Both with FastReport.
When you install FastReport from GetIt, it is installed in wrong path.
Default path where FastReports are installed is C:\Program Files (x86)\FastReports.
The current installation overwrites the files of the last installed version.
After that, you can't uninstall both versions.
Fast Report should be installed to different directory.
XE2: "C:\Program Files (x86)\FastReports\FastReport 4 Embarcadero edition"
10.3: "C:\Program Files (x86)\FastReports\FastReport 6 Embarcadero edition"
If you have installed FastReport in C:\Program Files (x86)\FastReports\LibDxx you have to uninstall it first.
Where to get the installation?
After installation from GetIt, necessary files are in: "C:\Users\Public\Documents\Embarcadero\Studio\20.0\CatalogRepository\Fast_Report_VCL-6.2.1-10.3"
Uninstall it and install again in correct directory, never in same with other versions...