Quick edit to DEFAULTINVENTORYBALANCESURVIVAL.MBIN to make Survival and Permadeath mode have the same base resource stacksize as Normal mode (9999)
Browse to No Man’s Sky\GAMEDATA\PCBANKS.
Delete or rename the DISABLEMODS.TXT file.
Create a folder named MODS.
Place mod .pak files into the MODS folder (they have to be in the folder itself and not in any subfolder).
Start the game and wait for the splash screen to disappear.
If done correctly the game will display a warning just before displaying the selection of saved games.