Inventory grid view not working

[Wizhunter]

Hi Guys
Got quite a few addons and this is the only one that seems to not be working. Its shows in the folder and in the addon settings but its still the same inventory grid that it was, if that makes sense. When I press I and it comes up its the normal one not the addon.
Someone please help because I really like the look of this and its way better than the basic one.

I am on windows 10 btw, could that make a difference as to wether it works or not ?

Thanks in advance

Wizhunter