Thanks, that’s perfect. Much appreciated.
I had a similar experience with DxO. My old PC’s hard drive failed (so there was no way to know the exact PC’s name). How hard is it just to deactivate all installs of my account and let me reinstall? They made me feel like I was stealing software that I owned a license for.
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Are you using a VPN? That screws things up for me on occasion.
Ha! This just happened to me, exact same message. It’s the first time I’ve launched PL8 in at least a week so I can’t say when the problem occurred. When I click “Retry” I get the same message, and my only other choice is to quit. I cannot find any way to re-enter my activation code.
I upgraded to a new MacBook Pro (and wiped my old one), and assumed that was the reason even though PL8 has been working fine on my new Mac until now. I have only activated PL8 once on my old Mac, and my new Mac would be the second activation.
I contacted support and haven’t heard back yet, and I’ll update my comment when I (hopefully) have a solution.
DxO support got back to me pretty quickly. The problem was due to migrating to a new Mac. I deleted the old PL8 licence file at ~/Library/Application Support/DxO/Licenses and then when I launched PL8 I was prompted for the activation code.
Given that most Mac users make use of the migration feature to transfer to a new Mac, DxO should consider a better error message that points to a FAQ with the answer that support gave me, or modify the software to automatically delete an old licence on a migrated Mac. I’m sure that would save a lot of support requests.
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I think mine was the same problem. I recently did a migration. However my old laptop had been wiped. I had a bit of back and forth before they sent me a dev build with instructions to remove the existing and install it. That worked once I entered my license codes,
Thanks for this tip; I’m going to be doing a migration next week! 
DxO definitely makes it a pain in the arse to manage licenses. I just did this, and it was relatively painless, but could still be made simpler.
Go to one of the two machines you have activated.
Cancel the activation and then save it.
The new activation will be reflected on your account page at “DxO.com”.
You can now activate your new computer
Thye cancelation must be done on the machine where you want to cancel the activation; it cannot be done on the account page from the website.
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Phil, how does one “cancel the activation” ?
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Cannot say that I see this in my account with DxO.
@PhilHawkins , please add a screenshot showing how that looks on your computer. Capture a big enough area so that we can see what window/panel/… is involved … and blur your activation code, should it be visible.
I can’t show you a screenshot of the process because I already have completed the migration. When you already have two machines activated, and you migrate a third instance of PL into your new machine - whether by the Apple migration process or a reinstallation of PL - when you go to enter your license code into the third machine it will tell you you’ve exceeded your activations and the will tell you what to do to deactivate one of the two existing activations. Once that is completed, activation is completed on the new machine and deactivated on the old. The real problem arises when you want to use two instances of PL at one time, something you cannot do, so it pays to close out ALL activations if you only plan to use it one only one machine which is what most people do anyway.
If you still need help, try this: https://support.dxo.com/hc/en-us/articles/7129117453213-I-would-like-to-transfer-my-licence-to-a-new-computer-How-can-I-deactivate-my-licence-from-the-old-one
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Thanks @PhilHawkins
Okay, DxO support handled the license management while you followed directions given on the page you linked into your post. Support seems to have acted diligently in your case. Others had more trouble according to a few posts in that matter.
Did you have to grant DxO remote access to your computer?
As a matter of fact, yes, but I declined. They just gave me the process and all is well.
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