@MarcusClifford @sishbi @Muttonjeff; we’ve just shipped a fix to the continue button that seemed to be unresponsive for some users. Thanks for your patience, and the upgrade flow should be working for you now! 
For others who may not see the option at all, the required app versions are 3.9.61 for iOS, and 1.0.34959 for Android. Apologies for any delay in accessing the above versions whilst the app stores work through the distribution, but most should be able to visit the app page directly to update.