the code change in the app needs to be made and then the governance QVDs have to be deleted before the app is reloaded. (Note that we moved these old qvds off to another location when we did this.)
"step 6. Remove the “governance” QVDs from %PROGRAMDATA%\Qlik\Sense\Log."
The reload may take several hours since it is getting 12 months data.
I did notice that the Latest Activity Measure default filter no longer works properly (does not work at all) after doing this, but, the MONTH filter on the sessions detail page can be used to filter things. Have not resolved this issue yet. likely will need code change in the script to fix it. I have a ticket open with Qlik about this issue.