Fantastic effort on another awesome upgrade - a huge thank you and congrats to you and your team!

I've just purchased WB16 to upgrade from WB15.
Two questions please:
1) Do I just install WB16 then the Hotfix?
2) Any issues, anything to watch out going from WB15 (32 bit) to WB16 (64 bit) and are there advantages to going 64?