This is where mine is installed in Win 10 Home, YMMV but it’s likely as follows.
The program is installed as a Windows App so it is installed in the WindowsApps folder located in the C:\Program Files folder. It is a Hidden folder, so in order to see it, you will have to first open Folder Options and check the Show hidden files.
After you get into WindowsApps go into the Audirvana.Audirvana folder with the _x64 in the folder title, then the Audirvana folder, then you’ll see the Audirvana .exe file.
Edit–this may not work. I just tried opening the exe file manually from this folder and nothing happened. Not sure what’s going on unless it’s, for some reason, like its App status, only open-able from the desktop. I’ll keep looking but that’s the only Audirvana.exe I can find.
Edit #2: Try this as a path
C:\Users\user(or your user name)\Desktop\Audirvana.lnk
When I typed that path in Explorer it opened the program.
Learn something new every day…