Well, the only issue is that there are A LOT of updates after the initial installation currently, due to the ISO files being old. Of course with a partial update there will be problems (sounds like you cancelled the update process in some way). Like murbert said DEFINITELY first do a full update before installing anything else, to avoid complications.
I'd recommend updating via the terminal in your case, because that will give you more info during the process.
Run sudo eopkg up and then look at the output. If it's actually gets stuck in some place it should be apparent, and fail after a while. Note that some packages like the linux-firmware/headers, or papirus-icon-theme can take a long time to unpack, depending on your hardware.
