This is a simple cross-platform script to export your movies in Trakt to Letterboxd.
You require Python 3.x installed for this to run. To install Python please follow the instructions at the official Python website.1
To use run python3 Trakt2Letterboxd.py on your terminal. This will generate two csv files in the format required by Letterboxd. One titled 'trakt-exported-history.csv' (for movies you've seen) and one titled 'trakt-exported-watchlist.csv' (for movies you want to watch). You can import these files directly into the Letterboxd interface.
If you need more help running python scripts; please check these guides for your operating systems: Windows and MacOS. (Guys on Linux, you should already know what you're doing!). If you need more in-depth details please check this guide. If nothing works, please feel free to raise a github issue and I will try my best to guide you.
1 If you want a Python2.x version, please checkout the python2.7 branch in the repo. This branch is no longer supported.