Questions and answers:
Q: Where are the .txt and .xlsm files? I can't find them in my GOG folders.
A: Unfortunately there are no files in the Editor\Templates\ folder of the GOG version yet. But Cadmus88 from Larian Studios has posted a link to where you can download them:
https://drive.google.com/open?id=0BwnG474z1AoMdmZOUmEydXUxak0 More resources:
Amount of attribute, ability and talent points per level (should be identical in EE):
http://divinity.wikia.com/wiki/Character_Progression_(Divinity:_Original_Sin) (thanks to SniperHF for the link)