Where did Splunk 7.3.1 go?

I need the installation RPM of Splunk 7.3.1 specifically, in order to be version-compatible with another 7.3.1 instance that I already have. However, the official download page only gives me 7.3.0 now. In the older releases page, I can only find versions 7.2.x and below. Where did 7.3.1 go? I can't seem to find any information about critical issues with 7.3.1 which requires reverting back to 7.3.0...