Application Sync or AppSync is another unique ThinApp update method. AppSync was designed to help deal with the management of applications on unmanaged devices. Typical case of usage is a consultant having his/her own computer, and you have to provide an application to the consultant. Using AppSync you are able to maintain the application on the consultant's machine without the need of a locally installed management agent. AppSync can be run with the help of the standalone tool, AppSync.exe found in the ThinApp utilities folder. But most of the time you use the built-in AppSync feature in your packages.
When a package has AppSync activated, it will check for an updated version of itself when it's started. The check for update and the download of any updated version all happens in the background, seamless to the user. If there's a new version available, the package will download only the blocks that are different. When all the changed blocks have successfully been...