Hi Asyn, you do not need to do any specific steps to install Avast. If avast is installed, the SZB should be installed too.
lindainherriotcountry,
please
- restart your machine, wait 5 minutes
- write me what you have (or better attach screenshot) in the folder: c:\Program Files\AVAST Software\SZBrowser\
- please go here: c:\ProgramData\AVAST Software\Persistent Data\Avast\Logs\ and pack all the files and send me it to private message
Thank you