New Styles Working With Old Mods.
 

As I have around 50 Mods. installed, many of them don't work when I install some new style.

It takes a lot of time and research to make that new style work with those installed Mods.

May I know what you guys do?

You will need to make the template changes required by each of the installed modifications.

Its a huge hassle, but there's really not much of a way around it. I end up downloading half my mods a third and forth and fifth time just to get the install instructions again at a later date. :p

couldnt you create the new style, as a child style of a style, you have already done the changes to??