1) Have been using 32-bit by mistake. How do I switch to 64-bit and retain license?

Richard, The AVG 64bit install also uses 32bit. Have a look @ this link (https://support.avg.com/answers?id=906b0000000D5FOAA0).
AVG Guru

Richard, The AVG 64bit install also uses 32bit. Have a look @ this link (https://support.avg.com/answers?id=906b0000000D5FOAA0).
AVG Guru