To install IPFS goto:
https://dist.ipfs.io/#go-ipfs

To install python3 ipfsapi
pip3 install ipfsapi

Install IPFS by running install.sh

To test ipfs run: ipfs --version

If it returns: ipfs version ###### Then everything is okay

To init your IPFS node type ipfs init

To connect your machine to the ipfs network type ipfs daemon

You should now be able to connect to your WebUI on http://127.0.0.1:5001/webui

Run the python3 script using python3 ./main.py

If you get an error 405 error then you should try installing the IPFS py client from:
https://github.com/ipfs-shipyard/py-ipfs-http-client

You might need to edit conf.json to make things work correctly.

once main.py has been configured and ran then you just type: python3 ./download.py and it should download everything

It Should "Just Work TM"