Avast for USB and U3

Had a Scandisk U3 which has a Avast for U3. Can’t find it as I removed it changing to a bigger Flash Drive with U3. Sorry to see and not sure why, its a trail and not a free version like avast! Home Edition - FREE and avast! Linux Home Edition - FREE. It would be great to have it free as I’m a Windows Home user and still a Home user even if I have it on a U3 flash drive. Also is their a USB version for Avast that works with “PortableApps.com” which is like U3 and maybe the same. Anyway to get the Avast U3 into a PortableApps flash drive and where is it hidden for download on this avast.com site.