Thanks for posting about ADE. It is currently in version Alpha 20 and supports most airport elements. It can also work with the in Sim Dev Mode to ‘two way’ edit a project. As mentioned already there is a forum off site from here which provides links to versions and support. Airport Design Editor for MSFS 2020 | FSDeveloper
It is a re-write of ADE for FSX etc since there are a lot of differences in features but does retain the CAD style of working
Thanks again for your interest