Personally I find on-line installers (not specifically for beta builds):

  1. much slower than downloading the full off-line installer on fast broadband.

  2. my major concern with on-line installers specifically is for installing a new AV, you are in effect on-line with no protection - if you do as is commonly recommended - as you have uninstalled your previous AV or you don’t have one.

  3. if you haven’t gone for removal of your previous AV - now you are potentially in the conflict scenario - which could lead to a failed or corrupt installation.