If setup.exe is started from the distribution package directory of the version that is already installed on the user's computer, the installed version will be automatically updated according to the settings specified by Installcomponents parameter of the configuration files.
Starting setup.exe from a distribution package directory that is not installed on your computer will install this version, and will not update any of the previously installed versions.
11.2. 1C:Enterprise application update by Microsoft Windows users without administrator rights
To allow Microsoft Windows users who do not have OS administrative rights to perform a 1C:Enterprise installation from a shared directory, set the AlwaysInstallElevated policy for the computer and user. You can set the policy either locally, in the Group Policy Control Panel (by starting gpedit.msc), or through Active Directory Policy Management.
The above steps can be taken not for specific users, but for the Authenticated users group.