IMS Global recently announced that they will no longer certify legacy versions of LTI after June 30, 2021. They also announced that all support for pre-LTI 1.3 versions will end on June 30, 2022.
Due to this specification being retired, we will be discontinuing active development of our Pressbooks LTI Provider plugin and archiving the repository. Like other plugins and themes that we have previously archived, this repository will remain publicly available in read-only mode, though we will be unable to provide support for users who wish to maintain or extend the project.
For our PressbooksEDU clients, we have developed and maintain an IMS Global certified replacement plugin, which supports the LTI 1.3 specification as well as the Assignment and Grade Services extension. We call this product 'Pressbooks Results for LMS'. It is currently available as an optional add-on for our SaaS clients. For more information, please contact our sales team directly.