Unable to install in macOS 10.13.6 Permissions issue?

Hi,

I am unable to install the free version into a MacBook Pro running macOS High Sierra 10.13.6

I am seeing the following error message:

"You don’t have permission to save the file “avastInstaller” in the folder “tmp”.

Can anyone help, please?

Note there is a separate subforum for Avast Mac users here: Avast Mac Security - Avast Community
You may get a better response by posting a question there.