I had the same problem and I could solve it:

1.- Delete the plugin
2.- Open your System Restore options and choose a previous restore point.
3.- Re-install the plugin.

I lost my personal startup layout, but for me is not a big thing.

Hope to help someone

Hi Abdullah!

As you say, your tutorial is perfect for beginners as me! This world of maps and texturing is absolutely new for me and I really want to learn about it, so thank you so much!

I would like to know how did you export the original maps (Material ID, Normal) from C4D?