1. Backup your catalog by copying it to another hard-drive. (Do not delete the Catalog)
2. Un-install all Lightroom programs. (In a Mac I think you just drag from Applications to Trash)
3. Download Lightroom v5.7.1 from here-
4. You need to expand the line -"Adobe Photoshop Lightroom 5 " under the section "Download Adobe Photoshop Lightroom"
5. Click on the Mac OS X Download (530 MB) link.
6. Install v5.7.1
7. You will need BOTH Serial Numbers for Lightroom-2 and Lightroom-5. The first time you run LR5.7.1 it will ask for the LR2 number first then the LR5 'upgrade' number. (Be sure to carefully store BOTH Serial numbers for future reference!)
This should get you going, just open your catalog file. If Lightroom does not find it and wants to start a new catalog- close Lightroom, find your Catalog in Finder and Double-click it to open.
Thanks for the response. Your steps are precisely what I had done before. I performed them again for good measure, and the results are the same. I'm still receiving this message:
Adobe Application Manager, required to start your trial, is missing or damaged.
Please download a new copy of Adobe Application Manager from
It maybe worth trying the Adobe Creative Cloud Cleaning Tool, and re-installing.
I know it says for CC apps and installs, but if I remember correctly it also cleans up everything Adobe on your computer. I can remember using it when I had troubles transferring from Lr5 to Lr-CC
Thanks for the additional tip.
I gave it a whirl and it suggested that I clean my host file. It attempted and it corrected 0 entries. I took a peek at the hostfile and it looks very pristine.
# Host Database
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
Any other thoughts? Surely someone from Adobe knows how to solve this?
Just a side note. If you just bought a current Mac model, then it probably runs macOS 10.12 Sierra and can't run any earlier system. When you get your Lightroom 5 installation figured out, be aware that there are a number of problems with Lightroom 5 on Sierra (See: Lightroom and Sierra | macOS 10.12). You might be OK if none of the issues in the linked Adobe tech note affect Lightroom 5 on your new Mac, but if you run into any of those problems, you'll want to plan to upgrade to the current version of Lightroom when you're able to.
I installed a copy of Adobe Application Manager that i found here: Adobe - Adobe Application Manager : For Macintosh
That got me past my error, but then it asked me to sign in (which it didn't do previously). After that, I clicked the option to license the application, but it didn't recognize either of my license keys (from Lightroom 2 and the upgrade to Lightroom 5).
Now I am able to run Lightroom 5.7.1, but it is only the trial version. Does anyone know how to get my license key in? (is this a new issue?)
Hi again. We are just other Lr users on this forum that is not always seen by Adobe staff, and I hope I am not giving you wrong advice (as a Windows person) and if the problem persists you will need to contact Adobe Support.
THBOMK the Adobe Application Manager is for people who have a Creative Cloud subscription. I do not see any need for you to have it as you are trying to install and run the 'Stand-alone' version of LR 5.7.1
The AAM would be running your LR as the Creative Cloud version, hence the "Trial version" as you are not a subscriber.
My thought would be to Sign-out of the Trial, un-install the AAM, restart Lightroom, and hopefully you get the 'Stand-alone' activation that requires the Serial keys.
Your situation now is very similar to the info at his link- (You are trying to convert a Lightroom CC trial to Lightroom 5)
WobertC: Thanks for the help. It seems I have finally sorted it out. Here are the steps that I think worked:
- Install latest version of Adobe Application Manager
- Remove Adobe Application Manager
- Remove Adobe Lightroom (5.7.1 from web)
- Install Adobe Lightrooom 5 from disc
- License Adobe Lighroom 5
- Install Adobe Lighroom 5.7.1 from web