When running install_gems.rb, the following error is shows:

E:/Ruby22-x64/lib/ruby/2.2.0/open3.rb:193:in 'spawn': Permission denied - E:\Ruby22-x64\bin install rubygems-update -v 2.7.6  --no-ri --no-rdoc (Errno::EACCES)
    from E:/Ruby22-x64/lib/ruby/2.2.0/open3.rb:193:in 'popen_run'
    from E:/Ruby22-x64/lib/ruby/2.2.0/open3.rb:93:in 'popen3'
    from E:/Connector/install_gems.rb:73:in 'run_command'
    from E:/Connector/install_gems.rb:39:in 'block (2 levels) in main'
    from E:/Connector/install_gems.rb:37:in 'each'
    from E:/Connector/install_gems.rb:37:in 'block in main'
    from E:/Connector/install_gems.rb:35:in 'chdir'
    from E:/Connector/install_gems.rb:35:in 'main'
    from E:/Connector/install_gems.rb:84:in '<main>'

This is caused by having GEM_COMMAND set incorrectly.  In the example above, the install_gems.rb is actually trying to execute E:\Ruby22-x64\bin, which is a folder and not executable.

You can verify the GEM_COMMAND with the following commands:

• Windows:

• Linux:

Operating System

• Linux
• Mac 
• Windows

• HP ALM Connector
• Team Foundation Server (TFS) Connector
• Jira Connector

GEM_COMMAND should be set to point to the actual gem command in the ruby bin directory.

In the example above, ruby is installed in E:\Ruby22-x64.  The gem command is in the bin folder so GEM_COMMAND should be set to E:\Ruby22-x64\bin\gem
 

Windows
Any currently open command prompts will need to be closed in order to ensure that the updated environment variable is applied.

Make sure you are not overriding GEM_COMMAND in the User section of the environment variables as shown in the image below.  The System settings shows a valid configuration, however it is being overridden by the User variable which is incorrect.

<Please see attached file for image>