I need minecraft help and i don't know what to do?

Right now i have 1.7.2 and was wanting to know if orespawn will work it 1.6.4 and i don't want to change my minecraft forge because i have 45 other mods is it going to affect it in any way and this is my email if you have any questions on the mods i have my email (ihl10@aol.com)