Where to find the extensions

Just installed the Nightly Built 3D Slicer in my Windows. But I can’t find the extensions to install. Below is the info of the Extension Manager error message and my system info. Thanks.
image
image
image

We are performing large platform upgrades I these weeks and as a result, there may be build errors in nightly builds. Check back tomorrow or use the stable version.

Got it. Thank you for your quick reply.