BITCOIN PAYMENT AT WWW.TI89.COM  
Once bitcoin payment is made and we received your calc ID (look under F1 : ABOUT)  at support@ti89.com we will immediately
email you back your activation key. Then download your app at www.ti89.com/apps/ , transfer it to your calculator as explained
at www.ti89.com/thankyou.htm and enter the provided activation key when prompted. You are now ready to enjoy the app. This takes less than 5 minutes.   

Contact us with any questions you may have at : support@ti89.com