Finally! Ok then:I need the step by step guide of how to install.
1. Download the version of forge you need, it should be 1060, right?
2. Launch the FTB Launcher and click "Edit Mods" when you've click on the pack you want to add forge to.
3. Click "Open Folder" and click at the top -"1.6.4", you should see forge in there, delete it and put your forge in.
Exit out and launch the modpack!