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To Recreate:
1.) Click on Download in main header.
2.) Go to Extensions Area.
3.) Choose ALL or Custom Widgets and Services
4.) Click AlwaysOn Subsystem
5.) On the popup, choose "Click to Download"
The extension will fail to import into Thingworx and is not valid zip file. It is also much smaller than the previous version (1264 Kb vs 4554 Kb)
William,
Thanks for bringing this to our attention. I've uploaded the extension again and verified it imports successfully into 5.3.
Thanks again,
Adam