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Manually launch the VSIXinstaller.exe from \Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE - same issue unless I'm administrator and then it works. From the help menu that opens, we see that VSIX installer wants to create log files in %TEMP%.
Which is \Users\Stéphane... for me... Oh... now there's a \Users\St%C3%A9phane directory too, that was created when VS2015 was installed, and sure enough... the install logs are there. Give my user full permission on that directory...
... and now when I double-click the VSIX file, it works. So the issue is with VSIX installer that has an issue understanding the accent in my user directory. Damn damn damn.
VSIX installer does something similar to