Downgrading

[Exsert]

So i want to downgrade to an earlier version of 3.8

Currently on 3.8.5 and i want to use skins but they are absoloutely messed up in the current version.

What can happen to the security if i were to downgrade to 3.8.3?

[Speysider]

All holes fixed are exploitable again. Downgrading is never the reason.
Can't you just edit the templates to make them work again? I had no issues at all with any of my templates upgrading to 3.8.5