Is there any way to run incompatible apps from future versions of macOS? I am running macOS Mojave 10.14.6 and I want to run an application which was made only for Catalina. I have downloaded “Noto” from the Mac App Store on another Mac (Running Catalina) and copied it on my flash drive. I did it using MY AppleID. 

When I run it on Mojave it doesn’t start. It says that I have an incompatible macOS version. 


I tried to edit .plst file in the package contents
I tried to run it through terminal


The app is not so popular so I can’t just download a .dmg .
In a word, No

There are differences in macOS versions, and if an app says "macOS Catalina or later" it means that it requires something that is specific to, introduced in and not in earlier versions of macOS.

For example if you have an app that requires macOS High Sierra or greater it will also (likely) work on Mojave and Catalina too, but not on Sierra.

So, sorry, but that app was written to use a feature of Catalina that is just not there in previous versions of macOS.

You could contact the developer and ask if it is possible but I would bet no.