Subject: [Project name] — handover and next steps

Hi [client name],

The agreed deliverables for [project name] are ready:
[list deliverables and file locations]

To get started:
[access steps and relevant documentation]

Please note the following open items or limitations:
[list, or state that there are none known within the agreed scope]

The next steps are [actions, owners and dates]. Any ongoing support will follow [the agreed support arrangement / a separate agreement].

Please confirm that you can access the files and let me know if anything in the handover is unclear.

Thank you,
[your name]