I should also have mentioned that those upgrading from an older version need to read the readme.1st file. Specifically (although I'm sure people should know by now to flush their buffers before upgrading):
Backwards-compatibility advisories
* v2.9001.477+ (Dec 3, 2002)
Client version v2.9001.477 will be the minimum build from which RC5-72 results will be accepted. These versions also utilize a new buffer file format that is incompatible with earlier v2.8 clients. If you are upgrading your clients from an earlier version, be sure to first flush your completed buffers and then manually delete those buffers prior to starting the new v2.9 client. The minimum upstream proxyper version supported by v2.9 clients is build 330.