At any attempt to run Android Mode a question about the SDK appears. Trying to load it automatically (somewhat) fails - it stops at 306MB out of 1GB and quits with an error. Some stuff gets installed in Documents\Processing3\modes\AndroidMode\sdk, but trying to point the path manually also fails. Trying to change android.sdk.path in preferences fails as well, in fact the line gets removed each time Processing with Android Mode is started.
I am out of ideas...