Convert SQL 2017 Express to licensed SQL 2017 standard

Hi,

I discovered that SQL 2017 standard not have a product key. The key is into the ISO installer.

So I installed an SQL trial version in a production host waiting to receive the product key.

Now I must change to licensed version in an production host  that can't be stopped for more of 10 minutes.

How can solve this problem? Remove and Install it is a long time.

If I install the licensed version over the trial with a setup as "repair" can I solve? There is a repair setup? And the repair change to license version the SQL?

Or what can I do?

Thank you

Giuseppe