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Updated through the launcher. Most settings are reset, specifically in build 12. The starting music immediately indicated this. Only the in-battle settings remained unchanged. Administrator privileges are present.
When the warning window appeared, stating that the launcher needed to be closed (even though it was already closed), and clicking "Retry," the window reappeared about 4 more times, then disappeared, and the installation proceeded.
In the launcher, in the list of modules, the HW-Rules module with the number 1.23 was activated, possibly because it was the earliest one in the folder (before the update, 1.34 was used).
This is an old bug, or perhaps it's supposed to be this way; I keep forgetting about it. When playing as red and it's blue's turn, and switching windows, all sounds are heard. When playing as blue and it's red's turn, and switching windows, everything is normal – the sounds disappear.