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Deactivation is only required if you're a Creative Cloud user. If you don't have a Creative Cloud account then you'll just need the serial number to access Lr on new computer.
To deactivate a computer you'll need access to a working computer with internet access.
2. Use your Creative Cloud credentials to access the account
3. Choose Plans & Products from menu bar
4. Now choose Manage Plan.
5. You should see a screen similar to below. Your active hardware is shown on right side.
6. Click on X button beside the computer you wish to deactivate
Deactivation is only required if you're a Creative Cloud user
Sorry but this is not true I have LR6 stand alone version. I used LR on desktop and laptop. My desktop was destroy. After reinstall windows I can't activate LR. LR show me the same massage "You need to deactivate another computer within 30 day to use this product". In Adobe account I don't have information about Activated devices.
Adobe chat service who should contact to deactivate a LR lisence must be the poorest support EVER! I have waited almost 1 hour to get help and "time to wait" goes up and down like rollercoster!! Shame on adobe!