Make sure that you have all Windows updates that are available.
The one thing that was causing it for me, believe it or not, was that I needed to do a clean installation of the latest Studio graphics driver from the NVIDIA website. After doing that and restarting, all was OK.
These CC applications are slow to install. OK with Windows 10 but I couldn't even get past the CC install on a Mac OS Catalina (see below). Yes, I see the % change on install (rather than download) grinds to a stop several times too.
Thought I would copy from my post in response to an old post to here as this is a recent topic.
I used Adobe Creative Cloud (CC) for the first time yesterday as I wanted to learn how to use Photoshop.
I tried to download Photoshop on my new Mac Mini for the last 24 hours without success. Basically the CC installer goes at a snail's pace then stops at 20% for hours. I then tried an alternative CC installer (2019 version) which did install very slowly (1 hour) but when I tried to install Photoshop the CC automatically updated itself first then stops at 7%. On closer inspection of the Monitor Activity during the CC installing only 0.2% of the CPU, Memory, disk usage and network usage were used. This is just ridiculous. I have never had such an useless piece of Mac software since 1992. Other Mac downloads like Microsoft Office have been quick on my Mac mini.
I ended up downloading CC and PhotoShop on a couple of cheap PCs here in the last 30 mins. Exactly the same home network. The Task Manager showed that the installer used up 50-70% of the CPU, Memory, disk usage and network usage - which is typical.
The important point I am trying to make here is that the network is irrelevant where the CC installer software is concerned. It is just a pathetic bit of software for a new Mac machine. It works just fine on a Windows 10 machine.
Please do fix the bug in the CC installer software for Mac users worldwide. Yes, I have gone through the many steps recommended on the Adobe website. Must have done the uninstall/install routine 20 times.
I will be waiting for the software to be fixed then I can use Photoshop on my Mac - maybe in 2023....