If the database master key included the Windows User Account key component, check the Window User Account check box in the Enter Master Key dialog. The master key of the database includes the Windows User Account master key component and this key component is not included or is missing or damaged, or the user's Windows User Account is new, altered (e.g. The date modified time stamp on a valid key file should not be more recent than the date and time that the key file was added to the database master key. Restore the original key file from a backup. The key file content might have changed. The key file could be damaged or missing. If you establish that your database used a key file then:. If you find a likely key file candidate specify the name and location of the key file in the "Enter Master Key" dialog, supply the other master key components and try opening the database. Typically, but not necessarily, a key file has a. If there is any possibility that your database master key included a key file, search your disk for possible key files. If it is not checked nothing is established. but not proved, that you were not using a key file. ) checked in Tools>Options.>Advanced(tab)>Advanced(section)?. 
Is Remember key sources (key file paths, provider names. 
Is the key file box checked on the Enter Master Key dialog? If the box is checked you are using a key file, if it is not checked nothing is established. The master key of the database included a key file component, and the key file is missing, damaged, or changed. You have recently or accidentally changed to a different keyboard layout. Make sure the password is entered correctly and there are no leading or trailing spaces. Press the reveal password button to the right of the Master Password field on the "Enter Master Key" dialog. The user is entering the wrong master password. What file Size in KB is listed for the database? Saving a database is different than closing/locking a database or exiting KeePass. Is the date modified on the file recent? It should have a Date modified timestamp that corresponds to the last time the database was saved. Navigate to the database using windows file explorer (Win+E). 
Try opening the database via the KeePass File>Open Recent menu item. Verify the database path listed on the error message is correct (see the attached example).The user is trying to open the wrong database.Carefully rule out every possibility below. Following is a list of the possible reasons for this error and some troubleshooting suggestions. It is unlikely that the 'Master key is invalid' error is wrong.
Have you recently made any changes to KeePass or its installation? Don't reinstall KeePass, it is unlikely to fix your problem, and it will complicate troubleshooting. See the KeePass Master Key documentation for more information. The database master password is a database master key component.
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