Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Photon PUN+ Classic Free.
Photon PUN+ Classic v1.92
+++ Please get the new PUN 2 package.
PUN Classic is only here to allow an easy update process for existing projects. +++
+++ PUN Classic will not support Unity 2020.
Unity beta versions are not supported. +++
PUN Features
Benefit from a tight Unity integration to easily develop and launch multiplayer games world-wide. Export to all Unity supported platforms including consoles.
Realtime Cloud
PUN games are hosted in our globally distributed Photon Cloud to guarantee low latency and shortest round-trip times for your players worldwide.
Multiplayer
Connect, Match and Play: PUN is the rock-solid foundation for any type of room based multiplayer game in Unity 3D. You concentrate on building a great title while we take care of the game’s backend.
Cross-Platform
Export to mobile, desktop, web or consoles: Photon is the standard cross-platform multiplayer service and the world’s #1 for Unity games.
Highest Scalability
Games built with PUN scale seamlessly and automatically in the Photon Cloud: from just a few to tens of thousands of concurrent users. Fair and transparent pricing included. Proven. Successfully.
Matchmaking API
You match players into games randomly or by parameterized searches. Or you create a list of open rooms and let players pick one. It works. Reliably. On mobiles, PCs, Consoles and in the web.
Customization
What multiplayer game do you want to build? FPS or arcade shooter? RPG or RTS? Racer or Sports? MOBA or TD? Another kind of action game?
PUN supports any type of room based games on any popular gaming platform.
See for yourself …
Client To Server
It just works. No punch-through issues whether with Reliable UDP, TCP, HTTP or Websockets. Photon’s highspeed client-2-server-architecture is the industry’s most solid foundation for your games.
Unmatched Flexibility
Photon is super flexible: you can match an iOS Game Center user with someone using Google Play Services, authenticate a user via Facebook or add a custom authentication, utilize a gaming service or hook in your own backend.
Worry-Free Pricing
Fair and Transparent: 100% usage based on a concurrent users (CCU) basis. Flexible: Start with a FREE plan, up- or downgrade at any time. Worry-free: no immediate cap when exceeding CCU with any monthly plan. Perfect for your game’s launch.