Restore database views on an iTop 2.7.x version as they were before iTop 2.7.0, so with their old naming convention.
Delete and rebuild the views at Setup, to generate views compatible with the way they were build before iTop 2.7.
Starting from iTop 2.7.0, due to an OQL optimisation, some columns in the views were renamed. If you have been using the views before 2.7, your reports might be broken by the update. In that case, deploy this extension to restore the views.
Use the Standard installation process as for most extensions.