Get the following error - which only seems curable by a complete reboot - then it works.
error.
Exception - Reason: Failed to localize one or more elements in the EXE bootstrapper. Make sure that [C:\myexefilename] is not being used by another process and the elements used by the bootstrapper can be accessed.
Build finished because an error was encountered.
No other files or programs are open or in use on machine during build. Edit - using latest 7.6 release.