Instructions from reddit thread

Instructions for installing iMessage-exporter for people who don't code:

1. First install Rust which contains Cargo:
   a. Open Terminal by going to Finder, Utilities, Terminal
   b. Type this:

   curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

   c. Hit enter
   d. Hit enter again when it prompts you if you want to customize or proceed with standard installation
   e. Close the Terminal window by hitting X (this makes Rust take effect)

2. Now install the iMesssage-exporter tool
   a. Reopen Terminal by going to Finder, Utilities, Terminal
   b. Type this: This will run for a bit and then throw an error.

   cargo install imessage-exporter

   c. You will be asked to install command line developer tools.
   d. Tap on "install".
   e. Tap on "Agree" to the terms and conditions. This install takes a good few minutes so be patient.
   f. Now go back to that Terminal window and rerun the cargo install:
   g. Tap on the Terminal, arrow up to bring back the last command, then hit enter.

3. You are ready to run iMessage-exporter. Note that this will run for a while, depending on how many text messages you have downloaded in the Messages app. In your Terminal window, type this command (where XXXXXX is your Mac username):

   /Users/kautilya/.cargo/bin/imessage-exporter -f html -c full

   Give access to terminal or iterm for Full Disk access in macOS -> Settings -> Privacy and Security

4. To find the exported files, open Finder and navigate to /Users/XXXXXX/imessage_export. They are html files and named after the phone number. Sort them by size to easily locate your top contacts.