[Duane Martin]

Though not officially supported Avid Media Composer 8.3.1 will install on Mac OS 10.10.3. The trial version is the actual full version with a 30 day limit. If you were to purchase a license you would simply apply the license to the version you have already installed.

As to “successfully”, there are a lot of bugs running MC 8.3.1, some of which might be attributed to the unsupported OS 10.10.3, but many have been around for a few MC versions. If you are installing this on a MacBook Pro and start experiencing frequent (hourly) kernel panics just quit the Avid Application Manager, but be aware it will start up again every time you restart your computer. No worries, the kernel panic will remind you.

No idea why you are seeing that error message but I will try to look further.

Duane Martin
Avid MC 8.3.1; FCP 7.0.4; FCP X 10.2.1; Premiere Pro (not currently)