First i try the Flans mod 1.7.2 and the robots not showing and the second i try on Minecraft version 1.12.2 and it's same. :C Can you please help me? Thanks!

It sounds like you probably don't have the correct content packs installed.
Do you have Parts Pack, Mecha Parts Pack and Titan pack installed?
Please let me know what is in your 'Flan' folder.