TIBCO (the parent company) maintains an archive of older releases for community members. Since version 6.8.0 is no longer listed on the front page, you need the direct archive link.
Let me know which you plan to use for your reports! download jaspersoft studio 6.8.0
: Once the ZIP or EXE is downloaded, extract the files (if using the ZIP) and run the Jaspersoft Studio.exe TIBCO (the parent company) maintains an archive of