Adobe Photoshop CS5 Extended was a popular version of the software, released in 2010. If you're looking for a serial number for the trial version, I have to clarify that the trial version typically doesn't require a serial number for installation. However, to activate the full version, a valid serial number is necessary.
Unable to Install and Activate CS5 on new Windows 11 PC | Community Adobe Photoshop CS5 Extended was a popular version
If you're looking for free options, consider GIMP, a powerful open-source image editing software. Canva is another great tool for graphic design and editing, offering both free and paid features. The Benefits of Using Adobe Photoshop CS5 Extended