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The client program is distributed as an executable installation file (MSI) or a network download (ClickOnce) and the client program has to be installed on each PC. The installation does not require administrator rights to the computer. The program can be installed to an area where the user has write access. If you want to install the program centrally for users you can use the supplied MSI package.
MSI Download
The ClickOnce distribution will update when there is new versions aviable. This happenes over normal HTTP.