Ok there is a problem with the Kamikaze mod in the new version.
Download the newest bugfix in the SR forum.
If you have devloped Kamikaze Units you have to mod your save game ( search tag = ger -> search flying_bomb = { -> flying_bomb = { 3 2 1 0 }
# 0 Early V-1
# 1 Advanced (US TM-61 Matador)
# 2 Kamikaze Attackplane
# 3 Manned Flying Bomb
Correct this to your techtree