Cannot restore purchased BetterSnapTool after downgrading to Big Sur from Monterey

Hi. After downgrading, I was trying to go to App Store on my Mac and find the BetterSnapTool. However it keeps showing 69,000 VND (as I'm in VN) and does not have an option with the cloud and download icon.

How can I restore my purchase? My AppStore email is Purchased December 22nd, 2021.


Note: Before bug reporting, please make sure you have tried the latest (alpha) version of BetterTouchTool and that you have already tried to restart your system :-). If you encounter a crash, please attach a crash log from the macOS from the "User Diagnostic Reports" section.

Describe the bug
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Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):

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Device information:

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