My subscription to Lightroom CC is expiring soon, and instead of renewing, I bought a Perpetual license of Lightroom 5.2. I'm having trouble uninstalling LIghtroom CC, but then I started wondering whether I really need to uninstall it at all.... Can I just release the current installation from my CC subscription, and then enter the serial number for the perpetual license? How would I go about doing that? What's the best way to proceed?
It will be necessary for you to uninstall the CC version. The licensing is handled completely differently, and you will have to install the standalone version that you purchased. And you'll probably want to update it to Lightroom 5.6. You will be able to use the catalog that you have been using with Lightroom CC.