Ask your neighbor if he has unmetered Internet connection and if so, then chip in (⚠️ This may be against their operator’s terms of service. Before doing so, please check the terms of service)
Ask a friend with unmetered connection to download all the stuff for you and just hand you the disk
Use a public hotspot (such as McDonald’s Free WiFi) to download this stuff. Take into account that the download speed will be extremely slow.
Rent a server in the datacenter (i.e. VPS), download the data there, and get the data using your connection only as much as you need at the moment. The disadvantage is that you don’t really own the data stored on this server.