I am not sure this contains a solution https://accountants-community.intuit.com/questions/1897109-does-file-is-currently-locked-by-another-...

If you learn something new, post it here or on the other thread. 

This cleared it up:
YY Represents the tax year in which you are working and X represents the network drive in which your ProSeries program is installed.

    Locate all files beginning with ~$, cut and paste files into a new folder on the desktop.
    Navigate to the Common Folder.
        ProSeries Professional Directory: C:\ProWinYY\Common
        ProSeries Network Directory: X:\ProSeries\ProNetYY\Common
        ProSeries Basic Directory: C:\BasWinYY\Common
    Delete files ~Users.lck and Users.net
    Close the File Explorer.
    Select Start and All Programs.
    Select ProSeries 20YY and HomeBase Tuneup.
    Launch the program and attempt to open the client file.

Thank you very much for responding.

:+1: :clap:

By the way, you can access them easier by opening them directly from the file in your #year#data file.