Hey there,
For those reporting issues with MacOS, the issue should now be resolved. More info here: Cannot install the game on mac - #8 by Tyrskorn-2108.
For Baltack, or anyone else having issues on PC, have a look at this page for more info and troubleshooting steps:
If it’s only happening in a specific region, an additional step to try would be changing the language in the Blizzard app between English (US) and English (UK).