Adding IC2 to Tekkit

[TheTheoryMan]

Is there a way to add IC2 to tekkit? I've tried just downloading it for 1.6.4 and click and dragging it to the mods folder, but every time I start up Tekkit, it reverts back to the page to choose which modpack you want

[Neowulf]

Block ID conflict causing a crash. Go look through the Platform Pagoda section for instructions on how to make a custom pack, which is what you're doing.

[Roversword]

What Neowulf said, at least it is very likely.

Your launcher is making a log file which contains a lot of valuable information. It may tell you (and us) why it reverts back to the launcher screen rather than starting the game.

 

It is very likely some id conflicts, however, it may also be another problem causing java exceptions. Only the log file will tell.

[Curunir]

Tekkit is now built around Thermal Expansion. To have everything work properly, you will have to do way more than just resolve ID conflicts - which is not trivial to begin with. Not recommended to invest so much time and effort unless you do plan on making your own modpack on the launcher.