Over the years, I have streamlined my workflow and flattened out speedbumps in Zbrush with custom scripts and macros. Now they're available to everyone! While I am giving this away for free, please make a donation of whatever this is worth to you :) Donate at least $1 and get tech support if you have any issues with the plugin.
1.4 Works in Zbrush 2020. It WILL NOT work in versions of zbrush before 2020.
1.3 Works in Zbrush 2019. It WILL NOT work in versions of zbrush before 2019.
If you want to use the plugin in version 2018, you're stuck with version 1.2
Ryan's Tools does NOT work with Zbrush 4R8 or any earlier versions of Zbrush
Unzip the contents and put them in your zbrush(versionnumber)\zstartup\zplugs64 folder.
Version 1.1 added a few more features which you can learn about here: https://youtu.be/uKxqDrXcD14
Version 1.2 gives you some nice new superpowers :) learn more here: https://youtu.be/YBXx5dXbgnU
Version 1.3: https://youtu.be/8Cp4LjZK8iI
The latest and greatest version is 1.4. Bug fixes galore and a few handy new bonus features: https://youtu.be/MCzLsN4Ch4c