Hello Mike,
Unfornuately you cannot do a partial upgrade on the TastyIgniter, it would have to be a full system upgrade to version 2.0. Documentation is now available here: http://docs.tastyigniter.com/
Please bare in mind that version 2.0 is not production ready, however if you still wish to upgrade also bare in mind, that all previous changes to core files will be lost when upgrading to this new version, so you need to back up your files and database.