Marc,
I just downloaded Oacs-4.5b.zip (177Meg). unzip (freeBSD 4.8) results in a similar error: bad zipfile offset (local header sig): 186428236
Maybe the recent solar flare contributed to the file? =)
The Oasis-4.5c.zip (177M) is a few kb larger, and took me longer to download (circa 33kb/s), but unzip worked with 0 errors.
I don't use vmware etc, but hope this helps.
Torben
