What kind of device do you have?
When you open iReal Pro, there is a MORE tab menu (depending on your device, on the top/bottom of your screen). Tap on that.
Then tap on EXTRA JAZZ STYLES. At the bottom of the page, it should say Installed in grey.
It seems like your purchase didn't go through with the email address you use here on the forum. I don't want to post personal information (email address, etc.) so please email us through the Contact Us form to check in case you used another account. Thank you Ray!