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The ‘emulation’ part of ‘tools::texi2dvi()’ has been somewhat enhanced, including supporting ‘quiet = TRUE’. It can be selected by ‘texi2dvi = "emulation"’.
(Windows) MiKTeX removed its ‘texi2dvi.exe’ command in Sept 2015: ‘tools::texi2dvi()’ tries ‘texify.exe’ if it is not found.
Source installation on Windows has been modified to allow for MiKTeX installations without ‘texi2dvi.exe’. See file ‘MkRules.dist’.