I tried twice recently to upgrade Skuid on our Salesforce Sandboxes from Rockaway - Iteration 10 (8.15.8) to Rockaway - Iteration 15 (8.15.17) without success.

Here are the steps I performed:

-opened the Skuid Releases page
https://www.skuid.com/releases/salesforce/ ^]
-opened Changelogs and Past Releases
-opened Rockaway - Iteration 15 
-clicked Sandbox 
Message: An earlier version is installed. It can be upgraded while preserving the existing data.
Installed: Rockaway - Iteration 10 (8.15.8)New Version: Rockaway - Iteration 15 (8.15.17)
-clicked Install for All Users
-clicked Upgrade
Message: This app is taking a long time to upgrade.
You will receive an email after the upgrade has completed.
-clicked Done
-didn’t receive email confirming upgrade
-reviewed the Package Details: Skuid (Managed) page & the Version Number  is still 8.15.8

Any thoughts on how to resolve this issue?