Once it looks like the picture above, it changes into the picture down below
Because then it finishes after 5 seconds and says "Open" and when you press "Open" it goes back into "Find additional apps"
I don't know what to do; this has been happening for weeks and I still can't download it at all.
Nobody can tell you anything without exact system info or other technical details.
The 0 to 99 part is probably because it's already downloaded and waiting in a temp directory. So there's nothing new to download.
But then some final part of the installation fails and prevents it from opening.
If this was me, and in the absence of any specific error messages or additional information, I'd run the CC cleaner tool here, to make a fresh start. Do any routine maintenance you can think of on your system, before trying a second time.
Sorry for the late response but thank you. I've done the required steps and Photoshop is now downloading properly.