To avail of the SpAgent Runtime features/fixes included in this release you will need to update your current permutation and install the required NuGet packages in your solution.
License Activation - Proxy Configuration: With the release of SpAgent 4.0.2017, a new ProxyConfigurationPolicy dictates proxy behavior when requests to the Activation Service must pass through an authenticating proxy. The default policy is to do nothing and to leave unchanged any default proxy assigned on the activation request at machine or application level. It is, however, possible to create a policy that overrides the default proxy and adds a proxy with appropriate credentials to the activation request. See the following article for more details https://support.softwarepotential.com/hc/en-us/articles/360026118934.