If you miss DH2 prompt on first launch, please do a complete uninstall, checking the box that say “delete all player’s data and database” Or use a 3rd party uninstaller like revo uninstaller.
After uninstalling DH2, reinstall using a new installer. At first launch DH2 will detect the DH1 installed in your system and prompt you the option to migrate your data.
If you are still having this issue, please send us a message though our support page.
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