If you receive an error stating "Read Error from Network (-105) when trying to activate your Simerics license, this indicates that your firewall is blocking communications. Your license is being activated and the license file (*.lic) is being generated, but your firewall is preventing that information from being sent back to your computer.
Do not try multiple times to activate your license. If you have an Intermittent license, this will use up one of your activations each time you attempt to activate. If this is the case, please contact us so that we can provide you with the license file that was generated, and if necessary restore any accidental activations to your license.
You need to adjust your firewall settings to allow communication with http://activate.simerics.com (note that it is http, not https).