Ogles2b is hosted by Sourgeforge. If is offline you might want to download from
The source code dwells in Sample NIfTI volumes and Open Inventor 3D geometry models are provided in the . Win32 (MinGW) executable and required libraries can be found in Download requires high speed internet access.
Downloading and decompressing will result in Ogles2b folder tree.
Please see install how to go from there.

Ogles2b is free software. You can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.