Hello when i try to install 4.2.1 all i get is a message stating that the disk image could not be opened. I have down loaded it several times and still no difference. I have attached a screen shot of the warning and I currently have 4.1.5 running good.
I imagine your download is corrupt. I just downloaded and installed, and got:
graham$ md5 unity-4.2.1.dmg
MD5 (unity-4.2.1.dmg) = dbe62996e43bb72fa64a74905c98af5f
graham$ ls -l unity-4.2.1.dmg
-rw-r–r–@ 1 graham staff 1280609610 2 Sep 08:42 unity-4.2.1.dmg
Yeah, Thats what I figured also, Thing is I downloaded it on two different occasions and still no luck.
if i remember correctly the first time I tried it about a week ago. I had a different error message and i believe it had more to do with a license issue then.