Normally when I upgrade Jenkins the first thing I have to do is go to \war\WEB-INF and get the slave.jar file for my Windows nodes. I ran the upgrade as usual this morning (to 2.46.1) and there was no slave.jar file there, or anywhere else I could see. I'm thinking they wouldn't have changed that so I can only assume it's missing. I tried downloading the WAR file but it's not there either. Surely they didn't just forget to put it in there?