FileMaker Go and iOS 11 Compatability
Apple released iOS 11 on Sept. 19th, 2017. FileMaker still has versions of FM Go out there for 14, 15, and 16. However, iOS11 is only compatible with FM Go 16 and Go 15.
Also, please note that iOS 11 only supports 64-bit applications.
Please see this knowledgebase article for more info.