Download and install the latest version of Timeless Time & Expense Personal on the new pc. 

The single user data files use the extension tls.  The name of the file is displayed in the title bar when running TT&E.  This is the file you need to copy between machines.  By default this file is stored in My Documents folder.  If you saved it somewhere else, you will have to use the windows search feature to find it.  When searching, be sure to append ".tls" to the name if is not displayed in the title bar.

If you are transferring the data file because you are moving to new pc, you will not want to create a new file when you first open TT&E.  To do this, cancel at the new user prompt, then use the File | Open menu item to open the transferred file.