Hi i'm an updater from v12.1 and had to uninstall v15 (manteinance updated) and run back to v12.1 cause with v15 it's impossible to create new custom layouts with all the driver in my pc (pdf24-microsoft-dwg2pdf). That's foundamental for my future works. Due to this issue the v15 i purchased is totally useless.
Please help me!

Please provide extra details on such matter.
pdf24-microsoft-dwg2pdf refers to a driver? Driver for what device?
What do you mean by not being able to create new custom layouts?