RN102 on 6.1.x Updating to latest but older firmwares are missing

I'm trying to get this NAS up to 6.10, didn't realize this one was never updated until this morning. I found the upgrade path for one this outdated and it appears I need to start with 6.2.5/6.3.5 then 6.5.2 and then finally the latest version. The problem I ran into is that the firmware download page only goes back to 6.4.5. Is there another place I can get 6.2.5 or 6.3.5 from. I'm assuming it is not safe to go directly to 6.4.5 from my current firmware.

Thanks