Change SQL Version without uninstall

If you want to change the SQL version, i.e. SQL Express Edition To SQL Standard, you can do it using the following:

1. Put the DVD on the Drive.
2. Start the installation from the command line (supose the DVD Drive it's e:\) using the following:

e:\setup SKUUPGRADE=1

3. Follow the instruction. If the instance to be updated is named, like myserver\sqlinstance, use the same name for the current instalation.

4. After the installation, you need to install all the SP for SQL.