Quote Originally Posted by raunharman View Post
Can we use plugins meant for 1.3x version on 1.5x version.
Only some 1.3.x plugins are compatible with zc 1.5.x, most of them are not.

Check the documentation of the plugin(s). If it is declared to be suitable with 1.5.x then you should be ok. If not then don't use it on 1.5.x