# Activation error: Signature validation error

If you encounter this **Signature Validation error**, you must update to the latest version.

<figure><img src="https://1039028294-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MkmLDl5OXrWVfn2nv57%2Fuploads%2F8k10wV2WddSwCSU8lLhX%2FsignatureError.png?alt=media&#x26;token=36824e1d-c594-44f1-a86e-5d8664ad63df" alt=""><figcaption></figcaption></figure>

**Download** and **install** the latest version of Seascape for Notes, which you can get here: <https://www.swingsoftware.com/download/dl-ssc>

You can upgrade your existing installation or perform a fresh install.

Instructions for **upgrading** can be found here: [https://docs.swingsoftware.com/seascape-for-notes/installation/installing-and-activating](https://docs.swingsoftware.com/seascape-for-notes/installation/upgrading)