transfer photoshop from one computer to another

Which operating system do you have?

Which Adobe product and version are you trying to install?

CS1, CS2, CS3 and CS4 activation servers are dead & gone. Even if you find an old installer, it's impossible to activate the software.

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 Win 11. Only the latest Creative Cloud products are compatible with new systems.

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Beware of fake Adobe reps who may contact you privately offering to sell you software or take control of your computer. It's a scam, run away! Real Adobe employees will never reach out via Outlook, Yahoo, Gmail or Skype.
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3 Easy Ways to Identify Genuine Adobe Staff
https://tinyurl.com/10791730

(this is the ONLY support Adobe still offers for old programs)
When you can't deactivate a serial number
BE SURE TO ONLY ASK FOR ACTIVATION SUPPORT TO ADJUST YOUR ACTIVATION COUNT
You may need to PERSIST or TRY AGAIN to find a support agent with more experience

This space is provided by Adobe, but it is not Adobe support
Sorry, nobody here can help with an account or payment problem
This is a public forum, you need the link to Adobe support, not other users
Be sure to remain signed in with your Adobe ID before accessing the link
Do be aware that Adobe's staffing is impacted by the virus, so wait times are long
-you MUST make sure that your browser does NOT block ads, scripts, or pop-ups
-you MUST also allow 'cookies' in your web browser for the link to work
This link will go directly to the chat option
Type "Agent" in the chat box to bypass the chatbot and be connected to a person
-Meaning type in the word Agent without the quote " " marks
https://helpx.adobe.com/contact.html?rghtup=autoOpen
- or https://helpx.adobe.com/contact/phone.html
.
Adobe does NOT do support by email, so beware of answering anyone who sends you a private message
-click for more information about scammers https://tinyurl.com/10791730

What is the version of PS that you want to transfer? If it's a Creative Cloud Subscription then you will be prompted while launch of the application that you need to deregister from one of the computers and you can do the same. See the following link for more inforamtion

https://helpx.adobe.com/download-install/using/install-apps-number-of-computers.html

If it is a CS version, then CS3 and CS4 have their activation servers put down so that is a dead end. For other later versions you can contact support and ask only for "the activation count reset" this is all they can help for with CS versions.

-Manan