Unfortunately the uninstall app won’t completely uninstall the conflicting files. You need to open finder, then the ‘go to’ command from the menu at the top of the screen. Searh DXO PURERAW2 and delete every folder and file that is shown. Then empty your trash folder.
Tested using both DPR2 and DPR3 as plugins to Lr Classic on macOS Monterey 12.6.3 on iMac 2019
DPR3 does not seem to check plugins that have been installed by previous versions. The ones I deleted had paths to DPR that were right a few days ago, before I moved the applications to a different folder - and installing DPR3 again did not replace the plugins
DPR2 has a menu that allows manual installation of plugins and Finder actions
DPR3 has no such menu. Bringing back that menu could provide an easy fix for plugin issues.
DPR’s installers can’t cope with multiple user accounts. Plugins and Finder actions are therefore only installed on the account that was used when installing. Again, the install menu of DPR2 solves that issue…while DPR3 presents a dialog (in very small, low contrast print) that is maybe not yet adapted to retina type displays.