I'm running r514 on Rpi. I made a backup then tried the update to r516. It failed with download error. I uninstalled HG completely and installed r516 from fresh. When I wanted to restore my backup file, I was unable to select the programs to restore. When I click the select button, nothing happens. I tried to install r515 but I got the same result. I had to fallback to r514 to have a working HG with my modules and programs.