I'm pretty sure that height map should be posted in Feral Heart -> Media -> Terrains
Also, here is a tutorial if you need it: https://www.youtube.com/watch?v=rAEgc3l2ByI
And If It still doesn't work, try using MediBang Paint Pro. It's free and supports layers and everything. Also If GIMP 1 doesn't work, try using GIMP2 xD
I'm pretty sure that height map should be posted in Feral Heart -> Media -> Terrains
Also, here is a tutorial if you need it: https://www.youtube.com/watch?v=rAEgc3l2ByI
And If It still doesn't work, try using MediBang Paint Pro. It's free and supports layers and everything. Also If GIMP 1 doesn't work, try using GIMP2 xD
Gimp2 is the one I tried, doesn't work at all. But thank you for the tutorial. It appears I saved it wrong, so I'll see if that works
EDIT: Two good news! I got gimp to install properly AND my height map works. I just saved it wrong haha. Thank you!