My mind has gone blank, I'm sure it told me in the admin how to update in previous versions. I'm on 2.3.6.1 and want to update to 2.3.7

I've downloaded the 2.3.7 folder, I've gone to my admin then clicked Update

All it says is:

How to update
•Clear the directory templates_c (delete all files in this dirctory) after you have added/replaced the files/folders

No update files available.

It doesn't explain how to update. Do I have to upload the complete folder or certain files to start with.

Can you give me the exact update procedure again?