Had a google and found on GoG forum that if I install the mod without ENB enabled it will work, it did, read also that if you then launch from the game folder settings exe it will launch with ENB (whatever that is?) enabled, this works too.
Tried GoG Stalker SoC, again it worked fine in Win10 64, installed Aurora 2.1 and crash as soon as I try to launch! Could not get Autumn Aurora 2.1 working with my original Stalker patched up to 1.6, although that game worked OK in Win10 64 before I tried installing the mod.