Beta install failure
I removed the previous versions of Security Assist and Data Assist (in order to install the beta). I then tried to install the SA beta update: "Can't update menus. The extension will not be installed". I decided to revert to the previous version - same error message. The Data Assist update however installed fine after this.
I have read that menus.xml can cause problems; I think the solution is to reinstall everything (and waste a lot of time). Given that I can install Data Assist without problems, it seems likely that the Security Assist beta is the problem. I would appreciate any suggestions. Eg could the installer have made changes to menus.xml which could be manually removed? (I have deleted the wincache file - I do this several times a day.)