Can't install a removed app
I'm assuming you installed Day One v2.  According to Day One, there's a specific way to uninstall the application.  I think you just need to delete the folder indicated in #2.


  
  Quit Day One Mac.
  Paste this into the Go to Folder window in Finder: ~/Library/Group Containers/5U8NS4GX82.dayoneapp2/.
  Drag the entire folder to your Mac Desktop. (This contains a local copy of your journal data backups and might be useful if any problems arise when you reinstall and reimport your data into Day One Mac 2.0.).
  Drag the Day One Mac 2.0 app from the Applications folder to the Trash Can.
  Be sure to quit Day One Helper in the menu bar if necessary.