The wallet of sia usually gives me problems, I download it directly from the official website and usually give error many times, someone knows why? First it says that it is updating to a new version, but in the end a critical error message appears and the wallet does not appear nor the platform appear ...
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Looks like your blockchain database, the consensus.db file, might be corrupted. In Windows, go to the folder
%appdata%/roaming/Sia-UI/sia
and delete the subfolders "consensus" and transactionpool. Open Sia again and let it sync the blockchain again