If you have trouble installing Notes 9.0.1 on Mojave with the installer erroring with

“File /Applications/Notes.app/Contents/MacOS/rcp/rcplauncher not found. Provisioning process failed to launch or was terminated before status could be determined.”

a very quick reminder for this error that occured first on the APFS file system using High Sierra - make sure you have downloaded the 9.0.1 installer from March 9th this year (passport advantage code CNQY7EN) and not the original one from 2015.  The one from March will install correctly and then let you install the IF16 fix  (901IF16) from IBM Fix Central that was released on September 24th on top to support Mojave.

If you already had Notes installed prior to upgrading to Mojave the IF16 fix installed on top should just work, this is primarily for new installs.

I would suggest going ahead and get rid of your 2015 9.0.1 client installers and get the new 2018 one in place just to be safe