Hey! Glad you like the look of it :)
It's compatible with 2019.4 (LTS) for sure - the effects were mainly developed in 2019.3, so the jump to 2019.4 doesn't really break anything.
Thanks for flagging up the broken link - that's a hangover from when these shaders were split into separate assets on the Store for built-in and HDRP. I've updated the link now.