The default admin username/password is Admin/admin.
Can you try it?
In the CutechatStandalone.sql, you can find the following code which sets the default admin name and password.
-- Default administrative user
IF NOT EXISTS (SELECT Username FROM Users WHERE Username='Admin')
INSERT INTO Users (Username, [Password], Age, Gender, Location, Occupation, LastLoginTime, DateCreated) VALUES ('Admin', 'admin', 35, 1, 'Ontatio, Canada', 'Web Developer', GetDate(),GetDate())
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