I have installed Retrosmc without any problems on my Pi2, and Master system/NES games work perfectly.
But I cannot find any Amiga or C64 emulators when i FTP into my Pi to transfer ROMS.
On a normal Retropie install, I get a an Amiga and C64 folder, but not on my Retrosmc install.
I have also tried a re-install with no help.
Do you know what I am doing wrong?
That is rather strange.
The folders in /home/osmc/RetroPie/roms should be created automatically.
Try to install the emulators in question manually from the retropie-setup script.