To make sure you get the best method for your situation, are you: Installing on an early Intel Mac? Trying to install in a virtual machine (VMware/VirtualBox)? Making a bootable Tiger DVD - Apple Support Community
Once installed, you should update:
This guide explains how to install from a Retail DVD DMG onto a vintage Mac. Because this is a "Retail" version, it is designed to work on any supported PowerPC-based Mac. 1. Pre-Installation Requirements Processor: PowerPC G3, G4, or G5 (300 MHz or faster). MAC OS X 10.4.6 Tiger -Retail DVD-.dmg
Please note, handling .dmg files: