Mini Rambo Firmware-Boards Manager Problem

I’m trying to get setup to flash firmware onto the mini rambo.

I was following the guide on here and hit a snag.

when trying to add the rambo board through the boards manager i’m getting the following error.

Error downloading

if I try it again I get CRC doesn’t Match, file is corrupted. It may be a temporary problem, please retry later.

any thoughts on this?

I just tried that link and it worked. If you are still having issue try going back 2-3 versions of arduino, maybe an update messed it up.