I've upgraded SpamSieve on iOS 10.15.7; much of my good mail goes to junk & won't retrain

SpamSieve
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I’ve cleared out Junk and Spam but haven’t installed the script because I could not find the following. When I go to the Finder Menu’s listings via GO, there is no Mail listing and no Preferences listed. I cannot find /Users//Library/Application Scripts/com.apple.mail anywhere on my computer. Please help me clarify these directions, below, for iOS 10.15.7 Catalina:

  1. Click here to download the script. Move it to the folder /Users//Library/Application Scripts/com.apple.mail. To access the Library folder, click on the Go menu in the Finder while holding down the Option key.
  2. Go to Mail’s Preferences window and create a new rule at the top of the list (above the SpamSieve rule) called Rescue Good Messages SpamSieve.
  3. The rule conditions should say Every Message.
  4. The rule actions should say Run AppleScript […]Apple Mail - Rescue Good Messages.scpt. First, choose Run AppleScript from the pop-up menu; then select the Apple Mail - Rescue Good Messages.scpt file (using either the pop-up menu or the Choose… button).