The current approved version of IES VE Title 24 is VE 2015 Feature Pack 1 and not Feature Pack 2. This is approved with CBECC-COM v3c.
Approval for the Title 24 interface in VE 2015 Feature Pack 2 is pending but will include a Title 24 regulations version (4.0) so that subsequent minor revisions can go through fast track reapproval and we won't face a situation such as the current one where the latest VE can't be used for Title 24 Compliance.
For anyone who has already installed VE 2015 Feature Pack 2 but has urgent Title 24 projects to complete then you can access the installer for odler versions of VE and VE 2015 Feature Pack 1 on our Version Archive, see http://www.iesve.com/support/knowledgebase/faq/3582
The related article gives a list of all approved VE versions for building regulations that will be kept up to date and can be consulted.