A question on the Wallet,
I want to upgrade to the latest wallet
so do I have to download the blockchain again or can i extract it from the outdated wallet and just update it?
No need to download the blockchain again unless you face an issue synchronizing. You can check intructions for upgrading here (very simple: essentially you close Sia and replace the old installation. Next startup can take a long time):
https://siawiki.tech/client/updating_the_interface