I'm using a existing save file by SimReno can I still use this mod. I love having more fun Mods in my game. Plus I am doing makeover's on Townies it's slow by using different creators CC makeovers. I'll eventually complete my own.
Sure, you can install it while you're playing a different save. It won't do anything until you go to start a new save file - all of the existing saves you have are safe to use.