Any trick to downgrade successfully from Unity2019.3.3f1 to 2018.2.15f1?

Hello! I am kind of new to Unity, and to forums.

First of all, I am going to tell you a long story about the project I am trying to make, to see if someone can give me a better way of making it:

Some time ago I tried to make a multiplayer videogame on Unity, but I couldn’t get the multiplayer part of the videogame working.

I recently found this NetworkManager component and tought “WOW MY PROJECT WILL BE FINALLY POSSIBLE!”, but when I tried to use NetworkBehaviour it gave me an error that said that NetworkBehaviour is obsolete.

So, I tried to find a Unity version where NetworkBehaviour is not obsolete, and decided to install Unity2018.2.15f1, but when I reimport the project it obviously gives me 173 errors and 84 warnings. (I have a backup of the original project, so don’t worry about that).

(Sorry if my English grammar is kind of bad, English is not my first language).

SO, THE POINT OF ALL OF THIS IS:

Is there any trick to downgrade successfully from 2019.3.3f1 to 2018.2.15f1? And if not, is there a better way to do the network thing?

I would be really grateful for any ideas you could give me.

Thank you so much for taking the time to read this.

Probably just recreate the project and copy and paste/import what you can

@Unity3DNewb

You are going to want to check out Tom Weiland’s Networking Tutorial Series on YouTube. This will get you up and running in a 3D Environment across a network.

The project is such that you could adjust it to a 2D game as well.

The tutorial took me a while to get through (about a week) but well worth your time for 101 handling stuff over a network.

Also I believe your version of Unity will Work with this tutorial. I actually had to update from 2018.2.(something) to 2018.4.17f.