Forge setup and HQ card import

I don't know if this particular issue has been answered, or maybe I am making more work for myself. I have now spent three days getting Forge setup and still not done.
I used Gathere Extractor to download pretty much everything. As I am on a very slow download, it took a day and half. I had used this progrma before, so I am not a complete idiot using it (I hope) and now I have a folder with all the cards from Scryfall (and wizard's Gatherer if something was missing.
As a test, I import the Tempest bloc into the right folder and not all graphics showed. I rename the folder TM to TMP and now they show. I am finding I am doing this for almost every single folder, and some still not showing up. I found the editions folder in the res folder and opened all the set lists, seeing the metadata for code= and code2=... I started changing all code2 to match code as I want the subfolders to be the official set codes for when I update later down the line for new sets. I am left with a handful of editions that don't have a corresponding folder, and now I am finding both code and code2 were wrong for some sets (Master's Edition for one, GE downloaded Master's Edition to ME1, but the edition file has code=MED, which has no Master's Edition cards/incomplete...)
In the end I think I am making this way harder on myself, and not sustainable for future updates. Does anyone have advice on setting up a Forge install, hopefully without spending time downloading everything again.
I used Gathere Extractor to download pretty much everything. As I am on a very slow download, it took a day and half. I had used this progrma before, so I am not a complete idiot using it (I hope) and now I have a folder with all the cards from Scryfall (and wizard's Gatherer if something was missing.
As a test, I import the Tempest bloc into the right folder and not all graphics showed. I rename the folder TM to TMP and now they show. I am finding I am doing this for almost every single folder, and some still not showing up. I found the editions folder in the res folder and opened all the set lists, seeing the metadata for code= and code2=... I started changing all code2 to match code as I want the subfolders to be the official set codes for when I update later down the line for new sets. I am left with a handful of editions that don't have a corresponding folder, and now I am finding both code and code2 were wrong for some sets (Master's Edition for one, GE downloaded Master's Edition to ME1, but the edition file has code=MED, which has no Master's Edition cards/incomplete...)
In the end I think I am making this way harder on myself, and not sustainable for future updates. Does anyone have advice on setting up a Forge install, hopefully without spending time downloading everything again.