Older versions become archived internally, but they're still available.
File an SR to My Oracle Support and we'll have our Media team provide you a url specific to the platform and version that you require.
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Without a CSI to create an SR to Oracle Support, and subsequently the media team, unfortunately I can only recommend that you download the current version at this time - 220.127.116.11.
That's hardly a bad thing because it's a minor release version - not say 10g to 11g, or 11g to 12c.
You will have all the same functionality contained in PS6 / 18.104.22.168 as you had in PS5 / 22.214.171.124, just with additional bug fixes and improvements built in.