If you had AEM Forms 6.3 running on JBOSS and you're trying to apply SP3 you'd have those files already.
If you're just running AEM (OSGI), then you don't need to follow those steps.
Installing the service pack is as simple as pulling the package and uploading it via crx package manager.
There really isn't much more to it.
Day Software / Daycare is the Adobe Customer Care support portal for AEM, AEM Sites, AEM Assets, AEM Forms, AEM Screens, AEM Mobile. If you have a product issue that is where you need to raise it. If you do not have access to Daycare (and you should if you're a valid AEM customer) then you can reach out to your CSM (customer success manager) who is assigned to your account to reconcile access issues.