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Regrettably Avast have chosen to use “Opt out” for the install chrome option rather than the more user friendly “opt in” approach, which means you have to read all of the options carefully during the installation. You are given the option to “opt out” but many miss seeing it and possibly Avast benefits financially when they do. Avast is by no means the only company using “Opt out”.
If you update the program from within the Avast GUI, then the “Opt Out” occurs near the end of the update process. If you are doing a clean installation it occurs near the start of the process, and yes, these days, with all software you should always expect the possibility of needing to “Opt Out” to prevent something other than the software you actually want to install from being sneaked in during the process.