The ApSIC Xbench Connector for Memsource is now bundled in ApSIC Xbench 3.0 build 1362 or later. It is also strongly recommended that Memsource Editor (download from http://www.memsource.com) is installed on the machine to instantly fix issues found in ApSIC Xbench.
You can download ApSIC Xbench 3.0 from the Download page at http://www.xbench.net.