Sothe LTSC versions of Windows are not meant for consumer environments, they are meant for long term little change stable environments. They do not receive the regular updates that Windows 10 would normally Receive.
I am not sure if it is possible to just upgrade from the LTSC version to a Home/Pro/Education/Enterprise version or if you have to do a full reinstall of the system. You may want to reach out to Microsoft support to see what your upgrade path options are.
This is very odd decision, to limit users and decide should they play or not.
Everything is up and running with my Windows version, and instead of deactivation of this checksum in launcher, you just reject us. Dissapointing.
If neither of those solves the issue, then there may be a deeper system level issue with that Windows Profile. You can test that by creating a new Windows Admin account: Blizzard Support - Creating a New Administrator Account
If I had been in your position, I would have probably setup a dual boot windows build. With one being a newer version, so you would have some compatibility with newer software, but could easily swap back to the earlier version, and not have to buy much hardware.
Just in case you are having this issue. What worked for me was clicking the options wheel next to play on battle net and running scan and repair. I tried reinstalling battle net and it did not work. The scan and repair worked.
Pretty much any laptop with a discrete GPU from the past 10 years should be able to play the game, even if not at high resolutions and graphics settings. Because of the wide base of Diablo fans, the system requirements are on the lighter side, compared to some more intensive games, including Hogwarts Legacy.
As always with PC gaming, the spec recommendations may change over time, and you may have to experiment to get the best results. Note also that the final game may behave differently than the beta, which is an unfinished product.
Like most popular PC games, there is no Mac-native version of Diablo 4 planned as of right now. The latest Apple silicon chips also make it hard to dual-boot Windows in order to try Windows-only games.
But there are some potential options. If Diablo 4 comes to a cloud gaming service such as Nvidia's GeForce Now, Amazon Luna or Xbox Cloud Gaming, that would be one way to play on a MacBook, iMac or Mac Mini.
That's just the broad strokes for people already familiar with how Steam and SteamOS work. For a more specific step-by-step, this guide from overkill.wtf is one of the most detailed I've seen, including exact file paths you'll need to map within Steam. Gaming on Linux also has an excellent, detailed guide.
A few troubleshooting tips from my own experience: If the game either doesn't start or starts without sound, you may need to force the game to use a specific version of Proton (which allows Windows games to play under the Linux-based Steam OS). Right-click on the Steam library entry for Battle.net, and go to Properties > Compatibility and require the app to use the recently released GE-Proton 7-51-diablo_4_beta version, specifically tweaked for Diablo 4.
To get that specific Proton version, if you don't already have it, go to the Discovery app on the Steam Deck desktop, which is like an app store. Search for "ProtonUp Qt. Install" and run that app, and from there find and install the special "7-51-diablo_4_beta" version.
Once I'd done all that, Diablo 4 ran pretty well on the Steam Deck for me. At low graphics settings and 1,200x800-pixel resolution, I hit 40 to 60 frames per second most of the time, with some occasional lag and stuttering. If the game is missing audio or the Steam Deck controls don't work, you may need to double-check the version of Proton Battle.net is using, restart the Steam Deck or reinstall Diablo 4. Some combination of those finally got everything working for me.
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