I am trying to clean the Windows Registry according to the instructions of this guide: https://support.piriform.com/hc/en-us/articles/360048227291-Clean-the-Windows-Registry#clean-the-windows-registry-0-0
Unfortunately, the "Fix selected issues button" is not appearing. Where the button would be, it instead says "Review selected issues". Is the guide outdated, or am I missing something?
It's just a wording change on the button, so yes the guide is a bit outdated.
Click on 'Review Selected issues' and it will ask if you want to make a backup of the changes before continuing.
Note - it only backs up the things it will be changing not the full registry.
Then you will be given another box where you can 'Fix all selected issues" or scroll through them 1-by-1.
PS. Before using the Registry Cleaner tool you should read these:
For the official Piriform advice on using CCleaners Registry Cleaner see this: https://community.ccleaner.com/topic/59952-i-get-a-registry-error-on-ccleaner-on-windows-10-i-have-scanned-5-times/?tab=comments#comment-326804
Here is Microsofts stance on using any Registry Cleaner:
https://support.microsoft.com/en-gb/help/2563254/microsoft-support-policy-for-the-use-of-registry-cleaning-utilities