In 2013, development, support, and distribution of the Celtx desktop software (version 2.9.7 and older) was discontinued. However, .celtx files are compatible with the Celtx Online Studio, and can be uploaded to your online account.
Uploading .celtx Projects
You can import your old .celtx projects into the online studio using the steps in this article.
Legacy Studio (studio.celtx.com)
If you were once a user of the Desktop "Legacy Services" saving system, contact firstname.lastname@example.org. We will help you migrate your content to our Online Studio.