I've been trying to update AR5 to the latest 5.0.9 version for Mac and I'm having an issue with the disk image. I've downloaded it 3 times and have the same issue in all cases. When I try to open the disk image I get a warning:

"There may be a problem with this disk image. Are you sure you want to open it? Opening this disk image may make your computer less secure or cause other problems."

If I try and run first aid via Disk Utility on the Install ArtRage 5 package it suggests there might be some corruption or repairs necessary:

"The volume Install ArtRage 5 was found corrupt and needs to be repaired"

I was wondering if it's safe to use as I've not seen these sort of warnings with previous ArtRage updates and I wondered if any other Mac users have had this same problem with the 5.0.9 update?

I'm using a 2011 iMac with High Sierra.