I installed Gimp 2.7.5 from Gimp Win (sourceforge gimp-win project) onto Windows XP SP3.
I installed LQR 7 and had to browse to the install folder as the autodetect could not locate GIMP. Seemed to install OK and I can find the main file in "C:\Program Files\Gimp 2.7\lib\gimp\2.0\plug-ins\gimp-lqr-plugin.exe" along with a number of the other LQR files.
However, when I start Gimp and it queries new plugins a pop-up warning titled "gimp-lrq-plugin.exe - Entry Point Not Found" states:
"The procedure entry point gimp_drawable_get_thumbnail could not be located in the dynamic link library libgimpui-2.0-0.dll"
Once started I cannot seem to find LQR anywhere in the menus.
Any guidance appreciated or I can answer any questions if you wish to trouble shoot.