You can get the .msp patch by going to our Essentials website and follow these steps:-
1) Enter the Read&Write 11 site license serial number to access Essentials.
2) Click on Upgrading from Version 11.0
4) Under Upgrading From Version 11 click the Upgrade from version 11.0.5 to version 11.5 link
5) Once the zip file is downloaded, extract the file to access the .msp file to run the patch