Apple has scheduled to release iOS 11 in the upcoming days. Silk Test 18.0 does currently not support iOS 11.
To continue testing on your iOS-based devices with Silk Test, don’t update these devices to iOS 11 until further notice.
Micro Focus is working on supporting iOS 11 as soon as possible, and we will notify you in another blog entry as soon as it is safe for you to update.
In the meantime, if you have any questions related to iOS 11 and Silk Test, please contact our support by visiting firstname.lastname@example.org.