Jaspersoft Studio -> Preferences compatibility problems

[d.polidori.ext]

Hello 
I have a problem on my Jaspersoft Studio: I have intalled Jaspersoft® Studio Professional 8.2.0 - Visual Designer for JasperReports 6.20.3. 

When I go into Windows>Preferences to set the compatibility , I see from the drop down list the reference to JasperReports versions 5.5.1 (marked as current),  5.2.0 and 5.1.0

I performed the same installation from the same installer of a colleage of mine and he can see from the ddl lots of JR versions: from current (6.20) to older (the version needed for our project is 6.13)
I followed all the steps from this document, but didn't work (and actually I could not find the button with Add From URL option)

How can I solve? It is a bit urgent for mya job tasks

Thanks in advance
Diego Polidori