Change construct 2 by 3

I have a project in Construct2, if I change to 3, I would have to start from the beginning?

Your project should work fine in Construct 3. In fact you can probably try it with the free version. (Just click on the Construct 3 link above.)

That said, if you SAVE your project using Construct 3 you will no longer be able to load it in Construct 2. At least, this is my understanding.

Making several backups before testing is never a bad idea.

It's a very big project, I don't think it works in the free version.

Making several backups before testing is never a bad idea.

A wise advice

You can still try and open it.

If it is only using standard addons, it should open. In the free edition, you won't be able to edit and save it, but it still will execute.

If your Construct 2 project is using third-part addons, you can have third-part Construct 2 add-ons in Construct 3 by asking their authors to port them using the SDK.

Otherwise, check the Exchange Addon or this dedicated forum to see if a port already exists.

Finally you can try this beta converter.

Once you have a Construct 3 version of the add-on, you can install it using the add-ons manager.