Avanquest UK Avanquest UK is part of Avanquest Software, a global developer and leading publisher of bestselling personal and professional software designed for PC maintenance and security, office productivity, communications and mobility worldwide. Headquartered in France, with operating units, subsidiaries and offices located in the USA, France, Germany, Great Britain, Italy, Spain, Japan, China and Korea, Avanquest Software products are marketed in over 100 countries, through e-commerce, OEM partnerships and IT resellers.