Chunky is a Minecraft rendering tool that uses path tracing to create beautiful images of your buildings.
Get the latest version of the Chunky launcher from here and start it. Press Check for update to get the latest version of Chunky.
If you want to get the latest snapshots, make sure to tick the Download snapshots checkbox before checking for updates.
More detailed instructions with screenshots are available on this page.
Originally created to add some 1.14 blocks, my fork quickly blew up to fully support Minecraft 1.14 and 1.15 while also fixing long-standing bugs.
Meanwhile, the fork was merged into the original Chunky and I continue development over there (via pull requests from the fork).
However, the latest launcher versions, information on Chunky development and everything else will continue to be published on this site.