In Riversong's diary I can't click "change skin" button

Assuming this is in 1.12 Dalek Mod?
The regeneration system was bugged before they moved to 1.16, so I think they're not gonna bother fixing it now.
You're probably better off getting 1.16 and waiting for them to release  a version with a more polished regeneration system

 and when will it be fixed?

For 1.12?
...It wont... I dont think

I guess you'll have to wait for it to be added to 1.16

Regeneration in that version was made by people who no longer work with us, and because of that we don't plan to try to fix it as it'd probably just break more. Sorry.

Can I ask which DMU version had the skin change work on last. I mean which DMU version had it workin be4 it broke.

iirc update 63 worked ? might be wrong though

 Thanks will try it