photoshop 5.5 deactivate

Yes there were Creative Suite CS5.5 subscriptions.

https://prodesigntools.com/how-adobe-cs5-5-subscriptions-work.html

Someone from Adobe like @Jeff A Wright  would have to say whether they are still active or not.

Only subscription software like Creative Cloud can be deactivated online.

Deactivation of 14 year old legacy software is only possible from the machine & OS user account on which it was installed.

Launch the app.  Go to Help > Deactivate.

MODERN OPTIONS:

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FREE Acrobat Reader -- view, comment, & sign PDF.
https://acrobat.adobe.com/acrobat/pdf-reader.html

Paid Acrobat Pro DC -- the complete solution for creating and saving PDF.
https://acrobat.adobe.com/acrobat/acrobat-pro.html

Photoshop Elements or Premiere 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

Premium Adobe Express ($10/month). Mobile & web-based graphics & video apps for social media content creators.
https://helpx.adobe.com/express/using/express-overview.html

Creative Cloud All Apps (20 + pro apps & services) and Single App Plans
https://www.adobe.com/creativecloud/plans.html

Hope that helps.

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.

<"moved from using the community">

there's a small chance you can deactivate via your account (if you purchased from or registered with adobe when you bought cs 5.5 and you remember the adobe id used to purchase/register).  check https://account.adobe.com

@miklóse36099833 Photoshop was not available on subscription prior to 2012, Photoshop 5.5 was released in 1999, and I'm not sure if that version required activation, do you mean Photoshop CS5 released in 2011.

There's no way to reset your activation count for older perpetual versions of Photoshop any longer.