Omnisend Extension version 4.5

We just went live with our first NOP website! The issue we are having is that the version of omnisend we are trying to install is 4.6 and our build is on 4.5. Is there a 4.5 version we can get installed?

Source code is available on GitHub. You can downgrade the plugin by the help of any developer.
//Rashed

Source code is also provided in the package (zip file) you can download from the marketplace:
https://www.nopcommerce.com/en/omnisend-ecommerce-email-marketing-and-sms-platform