hmmm-- Error -199 is a Resource Manager Errors (other than I/O) ="mapReadErr Map inconsistent with operation" according to an old Apple Error Codes '98 I have. Don't know what it means--Is your stuffit up to date? Any chance disk space was limited during the download, causing an overly fragmented download?
btw, 2.9.7 fixed some mac problems, so maybe a fresh download will unstuff properly. Do post back--sounds unusual.
[edit] just noticed 2.9.7 isn't yet listed on the free page, but does show here:
http://www9.limewire.com:82/download/2.9.7/