Had the same problem, and here is how I fixed it. Btw: Windows Vista 32bit. An older Version 2.71 (I'm not absolutely sure.) was installed before and after download of TT_Lib2-2.8.0.rbz a windows with several errors popped up, telling that several files could not be found in the ..\TT_Lib2 and ..\TT_Lib2\libraries\win32 directories. But these files are there from earlier installation.

However, after several unsuccessful retries I first deinstalled the plugin and then deleted the complete TT_Lib2 and sub-directories. Afterwards I installed the TT_Lib2-2.8.0.rbz again. No problems anymore.

So there may be a confusion with older files.

@thomthom: With this tool and your fantastic tt_lib2 tools you are my hero! Before, I was almost desperated.