Alrighty...
I downloaded the files via a PC, and I confess that i've been trying to do so previously via a Mac.
It seems that browsers on a macintosh rename the downloaded file (if it is a file type it doesn't recognize) and the mime type has to be specified in the browser (which I couldn't figure out at this time). It also changes the extension to .pl instead of a .pst.
I tried to test-download the files again (after entering several supposed myme types) on the Mac and though I successfully downloaded them it still renamed the files (due to some Pearl scripting issue from what I hear) - I didn't think this was an acceptable route since all the downloaded files are re-named the same.
With that said, though I would suggest at this point having all files .zipped for crossplatforming ability (like 'Magic Particles'), I'm not gonna complain if this is done in the future or not; simply because I really appreciate all the hard work and effort put into this site and I'm not gonna whine just because I'm using a mac. I do hope however that others may glean from my experience what they can so as to avoid the hassle of trying to figure out why it won't work.
Then again, (knowing that I'm probably missing some specific solution that is practically staring me in the face unrecognized), does someone have an alternate solution - so a person can download .pst files from a mac and not haveto borrow someone elses PC ???] If not, I'm cool with it.
Thank you all once again in helping me figure this out, I really appreciate it, and now I'll know what to do for next time!
Hope you all have a great weekend!