Installation steps:
Step 1: Open the downloaded AutoCAD2006 installation program.
Step 2: Click "Standalone Installation".
Step 3: Click "Install", and then start the installation process.
Step 4: Click on "Accept Installation Agreement".
Step 5: Enter the installation serial number.
Step 6: Enter the "User Information".
Step 7: Select "Typical" installation.
Step 8: Select the optional tools to install.
Step 9: Start the installation.
Step 10: Open AutoCAD 2006.
Step 11: Activate AutoCAD 2006.
Step 12: Copy the "Application Number" generated by the AutoCAD 2006 activation program.
Step 13: Open the downloaded AutoCAD2006 registration machine.
Step 14: Use the registration machine just recorded "application number" into "activation code".
Step 15: Enter the "Activation Code" into the AutoCAD2006 activation window to start activation.
Step 16: Activation is successful, AutoCAD2006 can be used normally.