Yes you can send them to the trash as the 32 bit installers will no longer work. But I would suggest running the Adobe CC Cleaner to completely remove PSE12. See section 3 at the following link. Get CC Cleaner Tool.
I used the CC Cleaner Tool. Then I deleted the AAM folder in Applications/Utilities. System Reports is still reporting Adobe AIR Application Installer (Library/Frameworks/Adobe AIR.framework/Versions/1.0/Adobe AIR Application Installer.app),
Adobe AIR Updater ( Library/Frameworks/Adobe AIR.framework/Versions/1.0/Resources/Adobe AIR Updater.app),
AAMLauncherUtil (/Library/Application Support/Adobe/AAMUpdater/1.0/AAMLauncher), AAM (Library/Caches/Adobe/AAMUpdater/AdobeApplicationManager-1.0/update14/Install.app/Contents/MacOS/Install, Lightroom Install App (Volumes/Lightroom 6.0/Install.app/Contents/MacOS/Install). Can I just go into Finder and delete them?