I have placed the beta versions of LimeWire 1.6b in the LimeWire beta directory at:
http://www.limewire.com/beta/1.6b/
You will find installers for the various operating systems there. The OSX installer is not there yet, but will be by tomorrow.
The changes in this version are relatively minor. The most significant change was a bug fix on the Mac where LimeWire would crash if users tried to share a top-level directory. There was also a bug that would occasionally arise on various platforms with accessing some configuration files on startup.
It would be a tremendous help if anyone who has a spare moment could give the new installers a try and report any problems back on the forum.
Many thanks to all.
-LimeWire Team