Cannot restore a file from Time Machine

I messed up a data file and tried to restore it from Time Machine. It produced the message "The operation can’t be completed because you don’t have permission to access VDJS 2016 Finances”. I am using an early 2009 iMac running OS 10.8.5. I have checked permissions, and since I'm the only one using this computer everyone has read - write permission. The version of the file I'm trying to use to replace the messed up one was saved only days ago and should have the same permissions. I apparently cannot use Disk Utility to check or repair permissions on the Time Machine if the problem is with the saved file. I have another backup using DropBox, but I have "cleverly" organized that so that it saves changes to files as they are saved to the computer, so it currently has the messed up version saved. Others have reported this problem resulting in this message about permissions, but not in similar circumstances as the situation I am in.