Hi, I have installed Processing 4.5.2 on OSX 15.7.3, but I can’t get the Contribution Manager to query any libraries. Modes, Tools, Examples and Updates are all blank too. It looks like it cannot connect to the internet at all - browsers etc all work fine. Any ideas?
Welcome to this forum. 
I have just installed Processing 4.5.2 on OSX 15.7.7 and the Contribution Manager displays Llibraries, Modes, Tools etc. so I don’t know what is causing this issue on your computer. Sorry I cna’t help further.