Everyone who has FTL will receive the Advanced Edition expansion for free. How you get it will depend on how you purchased FTL to begin with. Here are the instructions for each vendor:
Your Steam Client should automatically update FTL. By the time you read this, you have it!
The iPad version of FTL already comes with FTL: Advanced Edition!
FTLGame.com / Humble Store / Humble Bundle
The HumbleStore manages our purchases on FTLGame.com, so if you bought it from there the system is very similar to if you bought it from Humble Bundle or the Humble Store. If you connected your purchase to your account, you can log into your account and re-download FTL. The updated build available will include the Advanced Edition. You can log in from https://www.humblebundle.com/.
If you did not connect to a Humble account, then you’ll need your download link again. You can dig through your inbox to find it, or use their key resender:
Go to http://www.gog.com and login (if you’re not already). Then click on My Account at the top. That should bring you to your games library. Click on FTL and then download the Universal Updater, install it and you’ll be good to go!
Login to your account and go to this link to re-download and install the most recent version of FTL: http://www.amazon.com/YourGamesAndSoftware
Don’t hesitate to contact us at firstname.lastname@example.org, but please understand that there is likely a large influx of email and we’re only a two man team. There could be delays in responding.