In the past, I have been successful in downloading packages via the AREDN mesh network as there has been an internet connection available on the network which I assume can reach the AREDN package server. In the ADMIN page, I've been able to click the REFRESH button next to DOWNLOAD PACKAGE and all the packages would download successfully. Then I would choose SNMPD from the DOWNLOAD PACKAGE list then click the DOWNLOAD button. I would confirm that the package was now listed in the REMOVE PACKAGE list and all is good.