Can i only do upgrading my OS if i purchace Lion?

Or i can do clean install with that too
Thanks

If you purchase Lion from the App Store while you're in Snow Leopard and want to do a clean install, follow the instructions below to capture the installer file (InstallESD.dmg) and burn it to a DVD or USB thumb drive. Then boot from that media and do a clean install, if you prefer. Otherwise, you will wind up doing an 'upgrade' to your Snow Leopard install. If you purchase the Lion USB Thumb Drive, you can do a clean install or upgrade.
Steps 2, 4 and 5 are for when you are re-downloading Lion from the App Store. If this is your 1st download, you can skip those steps.
Backup your system first!
Use the machine OS X Lion is installed on.
Open App Store. Sign in.
Press and hold your OPTION key; then click on Purchases at the top of the App Store screen.
Under your purchase, look to the right of 'OS X Lion'. If Step 3 worked, the button on the right should say Install and let you click it.
Click Install. Let the download finish.
When you see the window open for installing the download, open FINDER, navigate to Applications and you should see the OS X Lion Installation App.
Right click on the OS X Lion Installation App and select Show Package Contents.
Navigate to the SharedSupport folder. You should see a filename of InstallESD.dmg.
Copy the InstallESD.dmg to your desktop
Close the window that's waiting for you to install OS X Lion. It's not needed anymore.
Check the Applications folder for the Mac OS X Lion. app file. If it's there you can delete it since it's not needed.
Burn the InstallESD.dmg to a bootable DVD.
Launch Disk Utility and click the Burn button
Select the InstallESD.dmg file from your desktop as the image to burn. Insert a blank DVD and wait for the the image to be burned.
Burn the InstallESD.dmg to a bootable USB thumb drive.
Open Disk Utility and drag the InstallESD.dmg file to the left side pane. Go to the Partition tab ad select 1 Partition from the drop down menu. Choose Mac OS Extended (Journaled) on the left. Click the Options button under the partition table and choose GUID Partition Table. You will need this to make the drive bootable on a Mac. Hit the Apply button when ready to format the drive (it will erase everything on the drive).
Click on the Restore tab and drag the InstallESD.dmg file to the Source. Drag the USB partition to the Destination. Hit the Restore button and it will create the bootable USB drive with the OS X Lion installer.

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