Older versions of Plex Server downloadable?

I would like to go back a version to see if it resolves my issue? Where would I find this repository?

Example “Plex Media Server 1.11.3.4803” for Windows 10

Under your Plex data directory, either the default path or the one you set in the settings section of you server, you will find a directory called “Updates” and in that directory you will find several of the most recent server install files. Uninstall your current version, but do NOT wipe all data, and install to one you want.

you can also find older versions here https://www.filehorse.com/download-plex-media-server/