Hello,
Issues are coming from the fact that you are using an old deprecated sIBL_GUI version!
I removed the old Change Log file from our repository, I will actually put it back but altered with a few warnings.
Basically now if you want to keep the 3.5.x because you are in 32 Bit:
Remove everything sIBL_GUI related you have:
- Uninstall the software, make sure you delete the installation directory.
- Remove the preferences.
- Delete the maya scripts / dependencies.
Once you have cleaned everything:
- Reinstall sIBL_GUI 3.5.x
- Install this version of the Maya Helper Script:
http://kelsolaar.hdrlabs.com/sIBL_GUI/Support/Softwares/Maya/Helper_Script/Relea...- At the moment you will launch sIBL_GUI, the Online Updater will kick in, you will have the Change Log missing stuff, anyway:
NEVER UPDATE YOUR TEMPLATES! The templates for sIBL_GUI 4 are not compatible with the one for sIBL_GUI 3, you should deactivate the Online Updater in the preferences.
From there you should be fine

KS