How can I use photoshop cs4?

If you have the license for Photoshop CS4 you can download it and as you have Photoshop cc uninstall it first then install CS4. You can find the CS4 software on Adobe website or if you don’t want to download from other places you can do that but I won’t recommend you that as it will be considered as piracy.

You have to have an adobe creative cloud account to log onto your Adobe account to run the software. If you failed to download and install I would suggest you buy a cd for it and then try.

You install the same way you did the 1st time... put your disc in the drive and enter your serial number when asked, or download the installer and enter your serial number when asked

Adobe removed old links from public view https://theblog.adobe.com/changes-to-creative-cloud-download-availability

-also read https://prodesigntools.com/adobe-limits-software-downloads.html

IMPORTANT NOTE:

The process below WILL NOT WORK if you have a (CS6 or earlier) serial number for an education or volume version, since the only downloads now available are the retail installers, which DO NOT work with an education or volume serial number

Start by reading reply #10 https://forums.adobe.com/thread/2620448

-Also read https://helpx.adobe.com/in/download-install/kb/downloaded-older-app.html

-And https://helpx.adobe.com/x-productkb/global/find-downloaded-file-app.html

-OR... Go to https://www.adobe.com/about-adobe/contact.html

-click on the Chat bot on the bottom right hand corner of the first screen

--the chat bot is the circle with a funny looking box with 3 dots inside

-click on Downloading or Installing, then type Agent

Do NOT let the support agent tell you to come to the forums for help... no user in a public forum has access to Adobe's internal links, you MUST obtain the program and update links from Adobe support

AND when you finally do have a download link, be sure to copy every file you download to an external drive (or 2 or 3) so you never have to hunt for download links if they are moved again... also make a text file containing ALL of your serial numbers and copy that file as well