Version sits in a sweet spot. Released during a period of high stability for Sato, it is less bloated than newer cloud-centric versions but supports the majority of legacy Sato printers (CL4NX, CT4-LX, GL408e, etc.).
Your Excel sheet is likely open in another program. Close Excel. Or, go to Start > ODBC Data Sources (32-bit) and manually create a DSN for your file. Sato Label Gallery Free 3.4.5 Download