The Ordo Hebdomadae Sanctae Instauratus is an for any traditional Catholic choir, schola, or cleric celebrating Holy Week according to the 1962 Missal. The PDF version is widely available and historically accurate. However, the term "install" is misleading—this is a document, not software. If you go in expecting to double-click an installer, you will be frustrated. If you go in expecting a classic liturgical PDF that requires manual placement on your device or printer, you will be very satisfied.