Fred, That error message (about moving your app) is the one I wrote into the program when macOS reports a more incomprehensible message. The app has always worked correctly when I moved it, but if not, try this:
Open a macOS terminal. Type in
xattr -rc
and then - this step is VERY important!!!!! - type a space after “minus rc”!!
Then drag the whole application into the terminal window. When the address of the application appears on the command line, press Enter.