They're Fab!
Being a fairly new user of iOS 10, it took a while for me to access these stickers. But I do thank the developer for their email with a link including instructions in response to my review. Life is good!
Response from developer
Thank you for being a TFF fan, and I'm sorry that you have not been able to enjoy playing with the stickers. Here is a useful link that explains how to access the stickers once you have installed them. Note that your iPhone MUST be operating with iOS 10+. Thank you for your purchase. http://osxdaily.com/2016/10/05/get-use-messages-stickers-apps-ios/
