"Why do you need such an old version?"
I know this might not be immediately obvious, but VMware Player v12.5.9 is the last version that works on older processors from before 2011*.
While that is probably not mainstream for VMware's commercial customers, there are some of us still using these old systems for personal use. So upgrading VMware is not an option for us, we are stuck on v12.5.9, and that is fine for most personal use anyway.
That said, it is getting harder to continue using this old version. Newer versions of the operating systems are making breaking changes to the system shared libraries that are increasingly incompatible with the VMware proprietary binaries. Nevertheless, there are workarounds.
I really hope VMware keeps the installer and product documentation around for this particular version v12.5.9 indefinitely, as there is a valid need for this version to still be available and installed.
* see https://docs.vmware.com/en/VMware-Workstation-Pro/14.0/com.vmware.ws.using.doc/GUID-BBD199AA-C346-4334-9F56-5A42F7328594.html