I've noticed that windows installer of blendigo does not deploy the same content in IndigoDir/previews as the .zip version. As a result, the preview function implemented into the script GUI does not work when using the installer. The console message complains about not finding some .xml-s. In fact the files are there, but with .igs extension.
My guess is that there are some other mixed-up in file hyerarchy in the previews too, because even renaming the extension the preview does not work properly.
I've fixed everithing deleting averityng and manually installing the zip version.