Following the instructions on the readme.md

running bundler install

An error occurred while installing thin (1.7.2), and Bundler cannot continue.
Make sure that gem install thin -v '1.7.2' --source 'https://rubygems.org/'

I tried 1.7.1 and 1.7.0 as well, same error.

I need an offline version, internet connection will be an issue this summer.

I also checked, and the Thin gem has not been updated in the last 3 years.

tia
Michael