I wrote mail to the developer ZR Rhelgeby!
He answered as quickly, here:
----------------------------------------------------
Me:
Have you stopped in this ZR development?
Zombie Riot crash and not work!
What future ZR 4.0???
----------------------------------------------------
RHelgeby:
Hi.
I never worked on Zombie Riot, but Zombie Reloaded. And yes, I haven't worked on any SourceMod plugins for years now.
Zombie Reloaded development has been picked up by others on the forum, so the plugin still appears to be maintained. I don't know about any replacement for Zombie Riot, but the source code for both plugins is always open source.
So far, I don't have any plans of development on SourceMod plugins.
Richard
Picture message!
https://prnt.sc/lvef0c
Welcome new mod Zombie Plague Mod by gubka!

Good Bye plguin ZR by RHelgeby!