Mounting it without specifying the password you be a bit silly, don't you think? The people at McAfee would be out of a job sooner than one would deem possible, even with the current crisis...
Mounting it with a password would require you to either load the McAfee software or have some compatible program. The latter seems rather unlikely, because again, McAfee is probably trying to tie you in, meaning proprietary algorithms are probably used.
Knoppix is very powerful, but it cannot do magic.
I read Endpoint uses AES, which is an algorithm "we" can do, but it's not so simple as piping your filesystem through a program that decrypts it: you want the files, not the raw filesystem blocks.
Your best option, I think, is to connect the disk to a machine that has Windows running, with the McAfee software...
(I'm just thinking out loud.)
Next time, use something like TrueCrypt, which is (a) free and (b) works on other platforms, so this cannot happen again...