The software is packaged with Inno Setup so you can explore the .exe using unpackers.
XnView-win-full.exe /? will give you the list of silent parameters or you can use this website to understand more about innosetup
A basic install can be performed using the below command
XnView-win-full.exe /VERYSILENT /SUPPRESSMSGBOXES /NORESTART /SP-
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