Assuming you are using a PC go to C:\Arkenforge\Arkenforge\MastersToolkit
and look for config.cfg take a copy of it (just in case) and open the file in the editor of your choice.
Search through the file and look for:
The numbers will be different on yours. Set them to the above numbers and start Arkenforge. The Palette tool should be in a place you can access it.