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You cannot downgrade DSM. You have DSM 7 now. This is OK too.
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Never use PMS 1.21.0.3744 from the Synology App Store. It does not work.
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You want this file: (There is a bug in 1.30.x right now)
Here’s how it works:
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All of your PMS server data is still in “Plex/Library/Application Support/Plex Media Server”
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You are going to Manual Install the version here
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It will look at your “Plex” shared folder and complain of error that it doesn’t have permission. This is good.
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The rest of the instructions here here… With Pictures

Remember please –
**At the end of any attempt to install, I tell you the information specific to you and your machine. Almost every message is custom per the user.