Microsoft released Rollup 13 for CRM 4.0 last week. The update can be downloaded here.
Please note that the language pack must be installed before you can apply the rollup for that language pack. The language pack can be downloaded here.
Please also note that rollup 7 is prerequisite for Outlook and the Data Migration Manager. Rollups 1 tm 12 are NOT prerequisit for the Server.
Additional you must have .NET Framework 3.5 SP1 installed.