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Unity Engine
4

This is honestly your best approach. There’s nothing to recommend the new input system that I have read and there are critical unfixed bugs, such as releasing keypresses when scenes change, cruddy edge case event stuff like that. These are all new input systems that do not affect the old input system, which works just fine.

I take it you did not use source control for instant revert to previous states?

I don’t know what all it flips. Your choices are:

  1. research what all the input system flips and revert it

OR

  1. make a new Unity project with the old system, then copy only your main project Assets/ folder over from the previous project

I suspect this will not copy the NewInputSystem being enabled.

Also… for future reference:

Please consider using proper industrial-grade source control in order to guard and protect your hard-earned work.

Personally I use git (completely outside of Unity) because it is free and there are tons of tutorials out there to help you set it up as well as free places to host your repo (BitBucket, Github, Gitlab, etc.).

You can also push git repositories to other drives: thumb drives, USB drives, network drives, etc., effectively putting a complete copy of the repository there.

As far as configuring Unity to play nice with git, keep this in mind:

https://discussions.unity.com/t/736093/3

Here’s how I use git in one of my games, Jetpack Kurt:

https://discussions.unity.com/t/807568/3

Using fine-grained source control as you work to refine your engineering:

https://discussions.unity.com/t/826718/2

Share/Sharing source code between projects:

https://discussions.unity.com/t/719810/2

Setting up an appropriate .gitignore file for Unity3D:

https://discussions.unity.com/t/834885/5

Generally setting Unity up (includes above .gitignore concepts):

https://thoughtbot.com/blog/how-to-git-with-unity

It is only simple economics that you must expend as much effort into backing it up as you feel the work is worth in the first place.

“Use source control or you will be really sad sooner or later.” - StarManta on the Unity3D forum boards