Try this, it's the only tutorial about this topic: https://simsvip.com/2016/06/27/create-mod-updating-mods/
Doesn't matter about some programs being old, because most never need updating as they don't rely on understanding game code, they just display or do something misc for you, like the XML Compare program in the tutorial.
If you still can't figure it out, start from the beginning with the
SimsVIP tutorials and grab the TDESCs. Zer0's tutorials might help: https://www.patreon.com/posts/tutorials-35031545
TDESCs help you understand how files are built and what each thing does. Zer0’s tutorials linked above have 3 different tutorials on how to use the TDESC, so make sure to read them to understand how TDESCs work.
TDESCs: https://forums.thesims.com/en_US/discussion/980807/1-66-139-tdescs#latest
TDESC Browser (Windows): https://www.modthesims.info/download.php?&t=618199
TDESC Browser (Mac): https://modthesims.info/d/649060/tuning-description-browser-for-macos.html
How to Properly Setup the TDESC Browser: https://www.patreon.com/posts/how-to-properly-42170948