We have removed older Deadline versions like 7, 8, 9 and some patch releases of 10 in 2020 from our downloads website due to deprecated security features.
It's recommended that you upgrade to the latest and greatest to avoid any security issues but we understand that you might be in the middle of production and cannot upgrade, therefore reach out to us to get those installers by cutting us a support ticket. We will be able to provide the installers greater than Deadline version 10.0.28 but we still encourage you to upgrade to the latest.
If you are upgrading from any version less than 10.1.10.6 to the latest and you have setup TLS enabled connection with a password set on Deadline Database certificate you'll need to upgrade to 10.1.10.6 first. More information is in this knowledge base article.