I read on the community that there is a problem with the photoshop v22.4 update showing a 403 error. I confirm that the problem is clearly with Adobe. I just bought two new macs, 1x imac intel i7 and 1x macbook pro m1. I installed these two machines at zero, that is to say that I did not resume installation or configuration from time machine, but carried out the installation over again. The error occurs on both stations. Unable to download and install photoshop while all other software installs without problem. I teach the adobe suite in a vocational school. I hope Adobe will quickly fix this problem.
Are you using the French version? If so, you may wish to add to the report at the link below on the feedback forum which is monitored by Adobe developers. There appears to be an issue impacting users of the French version