Mercurial uses Inno Setup for its .exe installers. You can choose the following option: /VERYSILENT .
They also usually offer .msi installations for download, but recently released packages are usually released as .exe before versions of .msi become available.
The Inno Setup command-line parameter documentation is located at: http://www.jrsoftware.org/ishelp/topic_setupcmdline.htm
Tip: Whenever I look for the command line option for the command line, I read the chocolateyInstall.ps1 file for the chocolate package.
For example: for hg, go to https://chocolatey.org/packages/hg and click on the "show" link next to "tools \ chocolateyInstall.ps1" (in the "Files" section) and find the variable named "$ silentArgs".
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