I have version 4 of Lightroom and I want to upgrade to the month subscription. My files are kind of unorganized also so would it
not be easier to uninstall and re set up the catalog with the new version?
It is not mandatory to uninstall the previous version of Lightroom in order to use the latest version.
Once you have Lightroom CC 2015 (latest version) installed on your computer, it will ask you to upgrade the catalog which you are using in Lightroom 4.
Please upgrade the catalog for the old catalog to be used in Lightroom CC 2015.
Hope this helps.