Welcome back. Boy do you have a lot to catch up on! 
No idea on exactly when you stopped, but maybe start reading the GM’s from this point onward to see how much has changed
#169 was posted at the end of March so happy reading.
Yes, GDStash is still around - one of the most popular tools for the game. The latest version is here
but I’d ask mamba if you need to install any older ones first if yours is way behind.