CS5 activation?

Dear All, 

thanks you suggest, has reinstall the software was all right.

CS5 and CS6 are on life support. But they can still be activated providing you have the following:
1. your original media (disks or downloads) you received at purchase and a way to read them,
2. a legitimate serial number for that version, language and platform (Win/Mac) and if it was an upgrade, a qualifying serial number from an older product,
3. an older operating system that can support legacy 32-bit apps.

NOTE 1 : Creative Suite installers won't work on macOS Sierra, High Sierra or Mojave without terminal workarounds. See the help article below.
https://helpx.adobe.com/creative-cloud/kb/install-creative-suite-mac-os-sierra.html

NOTE 2: Legacy Creative Suite will never run on Catalina, Big Sur or Monterey.  Nor will it be tested on Win11.  Only the latest Creative Cloud products are compatible with new systems.

what problem are you seeing?

This is a public forum, not Adobe support

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Please check the following Help pages:

• https://helpx.adobe.com/creative-suite/kb/install-creative-suite-5.html
• https://helpx.adobe.com/download-install/kb/downloaded-older-app.html#register-product
• https://helpx.adobe.com/download-install/kb/activate-deactivate-products.html