Notification Listener error message: Could not load file or assembly

After installing Produmex WMS, dll files are blocked by Internet Security.

Solution 1: Set the Internet Security by adding the Produmex download pages to the trusted sites internet options. Use Internet Explorer.

Solution 2: Open the properties window of the dll files and unblock the dll files.
The dll files can be found in the folder of the Notification Listener:

c:\Program Files\Produmex\Produmex SB1 Notification Listener (........)\  folder.

Solution 3: ​Edit the Notification listener config file.

C:\Program Files\Produmex\Produmex SB1 Notification Listener (........)\  folder.Produmex.Foundation.SboNotification.ServiceHost.exe.config

Add the following lines in the config file in the highlighted section.

<runtime>
      <loadFromRemoteSources enabled="true" />
</runtime>

Source: https://docs.microsoft.com/en-us/previous-versions/dotnet/netframework-4.0/dd409252(v=vs.100)?redirectedfrom=MSDN