photoshop cs4 upgrade

Did you register your Adobe products online?  If yes, there may be a record of your old CS serial numbers online.  Log-in below.

https://account.adobe.com/products

Please note that Creative Suite is no longer legally sold or supported.  Use at your own risk. It may or may not work on modern operating systems.

MODERN OPTIONS:
Photoshop Elements or Premier Elements (approx $100, no subscription needed).
https://www.adobe.com/products/photoshop-elements.html

Creative Cloud Photography Plan (approx $10/month for 12 months). Includes the folowing:
- Photoshop CC and Photoshop on iPad
- Lightroom on desktop, mobile and the web
- Lightroom Classic
- Portfolio website + hosting
- Spark with premium features
- Bridge
- 20 GB cloud storage (upgradable to 1 TB).
https://www.adobe.com/creativecloud/photography.html

Creative Cloud All Apps (51 + apps & services) and Single Apps Plans
https://www.adobe.com/creativecloud/plans.html

Clean and legal installs of either CS4 or CS5 should still work and be able to be activated. And it's true that CS upgrade versions don't require the prior release that they depend on to actually be installed on the system.

However, in no circumstance can any CS upgrade version be installed without at least knowing or having available the serial number of the prior version which it was upgraded from.

One thing you can do is check your online Adobe account to see if there's any record there of your prior version purchase(s). Please follow the steps described here:

https://community.adobe.com/t5/download-install/download-non-subscription-adobe-software/m-p/11977420

Hope that helps.

"CS2-CS3-CS4 are completely dead..."

https://community.adobe.com/t5/download-install/download-non-subscription-adobe-software/m-p/11977420#M530028

Assuming these are all for Mac or all for Windows, try

1. Install the CS5 upgrade version (don't worry about installing CS4),
2. Enter your CS5 upgrade serial number,
3. When prompted to enter a SN from an earlier qualifying version, enter your CS4 upgrade serial number.

That used to work for me.

Not keeping track of the serial numbers you have purchased is about the same as laying money on an outdoor table and letting the wind blow it away

There is no way that anyone in a public forum can help with a serial number that you did not record and safeguard