I have MAC and use Pro tools
MAC version 10.9.5 (Mavericks)
Pro tools 10
I heard can't use Q3 in old version
So i want buy Q2
Tell me how to buy Q2
You can simply buy Pro-Q 3. After your purchase, in your FabFilter account, click on "View license key" for your Pro-Q 3 purchase, then click "View license keys for earlier versions" to retrieve a Pro-Q 2 key.
You can download an older version of Pro-Q 2 that's compatible with your Mac here:
By the way, as of today, Pro-Q 3 still supports macOS 10.9, but it it's 64-bit only on Mac, so it won't run with Pro Tools 10.
As an addition, when you are using Pro Tools 10.3.5 or up, you can use the 32-bit AAX version which is still available in our 32-bit Total bundle installer: