How to silently install/uninstall IrfanView?

A: Usually, you can download the ZIP version of IrfanView and Plugins and deploy the files.
Self install versions have special start options for silent install (examples, version 4.20):
1) IrfanView:

iview420_setup.exe /silent /folder="c:\test folder\irfanview" iview420_setup.exe /silent /folder="c:\test folder\irfanview" /desktop=1 /thumbs=1 /group=1 /allusers=0 /assoc=1 /ini="%APPDATA%\irfanview" iview420_setup.exe /silent /folder="c:\test folder\irfanview" /ini="c:\temp" Options: folder:     destination folder; if not indicated: old IrfanView folder is used, if not found, the "Program Files" folder is used desktop:  create desktop shortcut; 0 = no, 1 = yes (default: 0) thumbs:   create desktop shortcut for thumbnails; 0 = no, 1 = yes (default: 0) group:     create group in Start Menu; 0 = no, 1 = yes (default: 0) allusers:  desktop/group links are for all users; 0 = current user, 1 = all users assoc:     if used, set file associations; 0 = none, 1 = images only, 2 = select all (default: 0) assocallusers:  if used, set associations for all users (Windows XP only) ini:      if used, set custom INI file folder (system environment variables are allowed)

2) PlugIns:

irfanview_plugins_420_setup.exe /silent

3) Uninstall:

iv_uninstall.exe /silent