Whenever I do a zip file, plus any waiting time until Allocator is available to actually post it on his site. So if you download Allocator's logos zip, plus all the individual logos in this thread since the last update zip (at the moment, in reply #134, 2nd October) you'll be up to date.
I generally wait until we get about 80 - 100 logos before I do a zip, and at the moment there are about 40 posted, so it will probably be a couple of weeks before I do another one.
HTH
Rod