@kmead Thank you for the test result. It makes it probable that your MAC/ SketchUp or Firewall or any other "middleware" is considering our SSL certificate invalid. To narrow down the problem, could you please run the following script? require 'open-uri' require 'openssl' url = "https://pluginstore.sketchucation.com/downloadtest.txt" save_path = File.join(Sketchup.temp_dir, "downloadtest.txt") begin # Bypassing SSL verification for diagnostic purposes IO.copy_stream(URI.open(url, ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE), save_path) puts "✅ Success! File saved to: #{save_path}" rescue => e puts "❌ Error downloading file: #{e.message}" end This script skips the SSL cert test. If it downloads the test file without any problems then it is very likely that the the problem is with the corporate firewall or with some other kind of middleware. If we know the result, we can try to create a possible solution which we can integrate into the next version of the tools.