Invalid agent assembly path

Problem:

• Installation of CodeTwo agent fails with "Invalid agent assembly path" error.
• The following or similar error event is recorded in your Application Event Viewer log file:

Failed to create type 'Agent.CAgentFactoryRouting' from assembly 'E:\Program Files\CodeTwo\CodeTwo Exchange Rules Pro\CodeTwo.ER.Agent.dll' 
due to error 'Invalid agent assembly path.'.Microsoft.Exchange.Data.ExchangeConfigurationException: 
Failed to create type 'Agent.CAgentFactoryRouting' from assembly 'E:\Program Files\CodeTwo\CodeTwo Exchange Rules Pro\CodeTwo.ER.Agent.dll' 
due to error 'Invalid agent assembly path.'. ---> System.ArgumentException: Invalid agent assembly path.

Solution:

You installed CodeTwo software in a non-default location, your "Program Files" folder is not on drive C: or the installation folder permissions were modified.

Apply changes to the CodeTwo installation folder permissions by granting full access for NETWORK SERVICE system account.

See also:

• CodeTwo and Exchange 2013 SP1
• How to manually install or uninstall CodeTwo Exchange Rules Transport Agent
• Transport Service does not start after installing CodeTwo Exchange Rules family software