use 1.12.2 in mcreator 2020.3

recently i've download  mcreator 2020.3 because i have 1.9.1 before and when i want to enter in my workspace i have an error that say :

-unsuported generator forge 1.12.2

so, i just want to know if it possible to stay in 1.12.2 with my old workspace

thanks !