If you are looking to buy a "Product Key" for this version from a third-party seller (eBay, resale sites), be extremely cautious:
A valid Bartender 10.1 Sr4 product key is usually a , often grouped in 5-character blocks (e.g., ABCD1-EFGH2-IJKL3-MNOP4-QRST5 ). Product Key Bartender 10.1 Sr4