> For the complete documentation index, see [llms.txt](https://ut.orels.sh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ut.orels.sh/extras/migration-to-v1.0.0.md).

# Migration to v1.0.0

### For Users

{% hint style="danger" %}
When updating to v1.0 from any v0.x.x release - you MUST follow these steps, or your projects will get compile errors
{% endhint %}

To upgrade, do the following

* Duplicate your main scene as a precaution (if you can)
* Make a new empty scene and open it
* Save the project
* Delete the UdonToolkit folder completely
* Follow the [Installation Instructions](/master.md#installation)
* Open the duplicate scene and see if everything works
* If it does - feel free to go back to your main scene and delete the duplicate

If you do get any issues - please do not hesitate to [reach out on Discord](https://discord.com/invite/fR869XP)

If you'll want to roll back - you should be able to follow the instructions again and import the older version of the toolkit (latest v0.x.x release). That operation **should** work, but generally speaking only forward upgrades are supported.

### For Developers

You do not need to use `[UTEditor]` attribute anymore! You can safely remove it as it is not being used by anything. I left it in the code just so you do not get any errors. But feel free to remove it when you'll get a moment.

{% hint style="info" %}
v1.0+ handles the custom attribute UI a bit differently than before, check out the new [Custom Attribute](/attributes/creating-custom-attributes.md) docs to learn more about it!
{% endhint %}


---

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