getting error while installing watir gem on ruby193
This is due to a bug in the mini_magick gem - see Issue 145. While the issue has been fixed, a new release not yet been released.
You can try getting the unreleased version of mini_magick, though it is probably easier to just use the older version.
Manually install mini_magick (previous version), then install watir:
gem install mini_magick -v 3.5
gem install watir
Can't install any RubyGems, invalid argument error when connecting to sources [gem 2.4.8]
There are [known] issues with SSL on rubygems.org, not on your machine. Explicitly set the source to be HTTP, not HTTPS:
gem install rspec --source http://rubygems.org
In your Gemfile (if any) you probably should set:
source 'http://rubygems.org'
as the very top line.
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