After downloading the file verify it's SHA256 checksum is 098d986f9e31f209e2bf58321977d3d7232d63d2b5981dce5f23036c6ef0d141 to ensure that it is authentic and not corrupted.
Then flash it to your microSD card and boot your Raspberry Pi with the flashed card.
When ready, connect to 'astroberry' hotspot and point your browser to https://astroberry.local or https://10.42.0.1
Connect your Raspberry Pi to your local network, using top bar Wi-Fi icon, update your system and... Enjoy!
Remember to like it on Facebook and visit YouTube for tutorial videos.
If you find this software useful, please consider making a donation.