An admin can update FlexForm anyways he likes.
If the FlexForm extension has its own git initialized, then FlexForm's Special Page might make updating even easier.
FlexForm special page is only accessible for a sysop and it will FlexForm's current installed version and if there are any updates available. Also a changelog will be shown to quickly check what the new version(s) has to offer. If you have FlexForm's installation connected to Git, then you can click the button on the Special page to have FlexForm checkout the latest version. Any messages and feedback will be shown on the page itself.
