Imac 2015 software upgrating from Montery to ventura version 13.1 mac 2015
creative cloud can not update photoshop and Lightroom because of the old software
iMac 27″, macOS 12.7
Sorry, a 2015 iMac cannot be upgraded beyond Monterey. See the following from Identify your iMac model - Apple Support
iMac (Retina 5K, 27-inch, Late 2015)
Model Identifier: iMac17,1
Part Numbers: MK462xx/A, MK472xx/A, MK482xx/A
Newest compatible operating system: macOS Monterey