There is no such thing as a "lifetime license." CS5 is a 13 year old, discontinued product.
You purchased Creative Suite with an activation limit. If you used up the available activations, you must deactivate one from the HELP menu on the device to which it was previously installed.
If that device is no longer available, I'm sorry. You'll need to get modern software to replace it.
Photoshop Elements (no subscription needed). https://www.adobe.com/products/photoshop-elements.html Creative Cloud Photography Plan (approx $10/month for 12 months). Includes the following:
Photoshop CC and Photoshop on iPad
Camera Raw
Lightroom on desktop, mobile and the web
Lightroom Classic
Portfolio website + hosting
Adobe Express (free starter plan)
Bridge
20 GB cloud storage (upgradable to 1 TB).
Free upgrades for paid subscribers
https://www.adobe.com/creativecloud/photography.html Creative Cloud Bundled & Single App plans. https://www.adobe.com/creativecloud/plans.html
Make sure your computer meets the minimum CPU & GPU requirements. Most Creative Cloud apps work on:
Windows 11 (64-bit), Windows 10 versions 22H2, 21H2, 21H1;
MacOS 14 (Sonoma), 13 (Ventura), 12 (Monterey), macOS 11 (Big Sur).
- https://helpx.adobe.com/creative-cloud/system-requirements.html - https://helpx.adobe.com/photoshop/system-requirements.html - https://helpx.adobe.com/photoshop/kb/photoshop-cc-gpu-card-faq.html
Hope that helps.
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