I've been banging my head against this issue for a while day. I had to install unity 2019.1 without the hub because the it kept refusing to connect to the internet. After that I've been trying to install the android SDK but I can't find a way to do so. There is no way to add modules to unity installations that were installed without the hub. I can't use the hub to just download the SDK seperately either. The unity editor is always checked in the download box. The offline download assistant doesn't set up the android SDK. The SDK version isn't mentioned anywhere so I can't just download the latest version and be done. The manual page simply tells me to use unity hub aaand we are back to square one. Honestly, every unity update has been a pain to migrate to but this one takes the cake. All I want is to make an android build.