A different version of this App is already installed with the same version number.

Russell Gove  If you delete the application

then please do the following steps

1. delete the app from recycle bin
   1. site contents 
   2. recycle bin (top right corner))
   3. select the app and delete
2. delete the app from the second-stage recycle bin 
   1. go to site contents 
   2. go to recycle bin (top right corner))
   3. select second-stage recycle bin (bottom left corner)
   4. then delete app