If you're a bit confused (as I was) why this is listed as "Free Personal": the main versions of IDA are not, they are offered as time-limited trials, only. However, if you open the Support section of the website and go to Downloads from there, you will find a version that is declared as Freeware, and free for non-commercial use. It's not the latest version (currently v7.0, almost a year old) and not the Professional edition – for those, you'll have to buy a license.
If you're a bit confused (as I was) why this is listed as "Free Personal": the main versions of IDA are not, they are offered as time-limited trials, only. However, if you open the Support section of the website and go to Downloads from there, you will find a version that is declared as Freeware, and free for non-commercial use. It's not the latest version (currently v7.0, almost a year old) and not the Professional edition – for those, you'll have to buy a license.