Issues which were resolved in the Pega 8.3.1 Patch Release can be found here.
Please note that patch releases are cumulative. Pega 8.3.1 includes all fixes made in previous Pega Infinity patch releases. Pega 8.3.1 is the highest quality 8.3.x version available!
Back in 2018, with the release of Pega 8.1, we announced our shift from hotfixes to Patch Releases. The patch release program approach allows us to bundle, test, & release bug and security fixes over a given period into a cumulative patch that will be available to all customers. This new process provides value to your business through improved overall quality and better dependency management. Look for a new cumulative patch release to be made available every month.
Please navigate to https://community.pega.com/digital-delivery. 8.3.1 is showing as available for download per the attached screenshot. If you still face issues please reach out via Direct Message and I will assist further.