The latest version is always listed on our change log page.
To download the latest version please re-use the download link in your original purchase email.
If you have trouble finding it search for an email from mailer@fastspring.com. If you cannot find your email contact orders@fastspring.com.
If you are using the Windows Store version simply use the Store app to get the latest version.
Please report any issues either on our forum or to our support@greenheartgames.com.