Using the FM19 editor & the FM18 editor as the same time - why not?

I cant to be seem able to use the FM19 editor & the FM18 editor as the same time together - anyone has the solution as i like to use both at the same to make custom items i have done last year
Any help would be appreciated
Thks

The recomendation from SI forums is to rename the exe file of Fm18 editor. The issue is that both Fm18 and Fm19 editors have the same exe file.

the same is said for the Mac, which i rename my editor file. Now both work side by side.