Running Package Manager to instal some extra programs, I get a lot of 'MD5 digest comparison failed' notifications.
(38 when installing mplayer2).
Package Manager was updated prior to installing.
I'm guessing it is a FreeBSD problem, but would like confirmation, if possible, thanks.

It is not a FreeBSD or GhostBSD problem this is the maintainer and developer problem.

I have just installed GhostBSD 2.5 and I get this error when I try to use package manager

This package manager is discontinued from this project can't help.