The current version of Audacity is 2.0.4.
VST bridge was for Audacity 1.2.x and should not be used with the current version of Audacity.
Audacity does not support all VSTs. In particular VSTi (VST instruments) are not supported.
See here for information about using VST effects with Audacity: http://manual.audacityteam.org/man/FAQ:Installation_and_Plug-Ins#vst_install