Activation

[Cevahir]

I have the physical version of the game but steam doesn't accept the serial. What should I do?

[Huperspace]

play it without steam or add a non steam game(your Ceasar 4 cd) to your libary
ask the support to get an steam key for it (low chances)
buy it on steam

[sämst]

i got the same problem.
its not working for me either, i have the cd with a cd key and its says invalid.

[nalvesmis]

same here ye