The 1.9 updates added the ability to register your Affinity apps and sync content, purchased from the Affinity Store, directly into Affinity apps . You can find more information about registering your Affinity app and content syncing here and here
Please note: If you're using a Mac you will need to be using macOS Sierra 10.12 or above for this feature to work. If you're using a non-supported version of macOS, you will need to manually download and install content purchased from the Affinity Store. More information can be found under the How to install content from the web section here