microsoft[.]com/en-us/software-download/windows10
neowin[.]net/news/the-windows-10-may-2020-update-is-now-available-for-everyone
neowin[.]net/news/windows-10-version-2004-is-coming---heres-what-you-need-to-know-about-it
neowin[.]net/news/the-windows-10-may-2020-update-still-has-a-whole-bunch-of-known-issues
So, I've been running a copy or two for about 6 months now, and the biggest change I've noticed is that opening Control Panel from Windows Explorer closes the Windows Explorer window. *Eventually* when graphics drivers are available that support it, you *might* see some improvement in AAA type games. Otherwise I find little exciting about things like an improved Notepad. [sigh]
How long it takes to update/install in it's current form depends on the horsepower of the device you're installing it on. A Low powered Celeron with 8 GB RAM & an SSD took hours. Watching Task Mgr., the individual apps that do the actual updating are a bit different when you use Windows Update vs. running setup from the ISO. The update routine's bad habit when it comes to the Recovery partition has gotten worse... It used to *Sometimes* create a new Recovery partition no matter how many were on the disk -- I have a VM that had accumulated 5! I updated the copy of Win10 via Windows Update that I'd had problems updating earlier. Before performing the update I removed the Recovery partition, and expanded the Windows partition to take over that now empty space. In the past that would mean I'd get one new Recovery partition -- this time it skipped creating one entirely. SO what happens if you leave the existing Recovery partition in place? Did that with the miniPC, updated using the ISO, and now I've got 2 Recovery partitions. [again, Sigh]
RE: my problem copy of Win10... I'd tried a few time using the ISO that was released for the Insider's program, and had zero success. I tried with the download available when Microsoft released it to the Preview Insider ring, and again zero success. This time using the ISO it restarted several times, and twice I got a BSoD, so Now I finally had a file name to go by. Tracked it down to some old software, uninstalled it, and tried again using Windows Update, which worked. The update/installer routine still leaves much to be desired -- you're almost completely in the dark about what happens, e.g. the Internet connection went down so the update reversed itself, removing every trace. The Only clue I had was the Roku had a message that it lost signal.
One *to me* ominous note: when trying to update using the ISO, while it was having problems & having to restart, the screen showed the brand or manufacturer's logo while booting. I have that disabled, and checking the BIOS settings afterward, it was still disabled. I have no idea if it was trying to boot into the UEFI's mini OS, or temporarily popping the BIOS into a default setting or what, but the idea of the setup routine altering or accessing the BIOS is a bit scary to me.
That all said:
windowscentral[.]com/how-delay-windows-10-may-2020-update-without-losing-quality-updates
windowscentral[.]com/windows-10-may-2020-update-common-problems-and-how-fix-them
Note: previously when I had problems I got the most benefit from unplugging the network cable when it 1st restarted. It didn't fix anything, but it seemed to get further before it died. Every other tip I could find seemed to me to be BS, the logs seemed worthless, and if this hadn't worked I was prepared to give up & delete that copy of Win10. IMHO don't knock yourself out trying to get it to work -- if I hadn't gotten the BSoD, and thus got a faulting file name, that copy of Win10 would never have gotten updated to 2004. NOTHING anywhere else gave the slightest clue that file was the problem.
Good Luck & Good Night