Hi, I currently have Lightroom Version 2. I would like to upgrade to Lightroom 6 to install a newer macOS. I talked to customer service for a half hour before finally getting told they couldn't help me. Is there any way I could use my current serial number, or do they have to generate a new one? I am not interested in any sort of Adobe CC or SAAS programs. Any help would be greatly appreciated!
There are no more perpetually licensed (pay once, own forever) versions of Lightroom Classic available any more so there are no upgrade paths available to you. Lightroom 6 stopped being available for sale several years ago.
You'll need to subscribe to a Cloud plan to use a newer version of Lightroom Classic.
You don't need to install or register Lightroom 2 in order to install the upgrade version of Lightroom 6.
I'm still unclear if you already have an upgrade serial number for Lightroom 6.
If you do, then forget about installing Lightroom 2. Just install Lightroom 6, enter your upgrade serial number for Lightroom 6 then enter your Lightroom 2 serial number when you are prompted for a previous serial number from a qualifying product.
To be clear, you cannot use your Lightroom 2 serial number to license Lightroom 6.