SpamSieve will automatically read the corpus and statistics from previous versions. To update to the latest version of SpamSieve, quit your mail program and the SpamSieve application and then replace the old SpamSieve application file with the new one. That is, if SpamSieve is installed in the Applications folder, drag the new SpamSieve application icon into the Applications folder and click Replace when the Finder asks if you want to overwrite the old version. If you get an error saying that you do not have sufficient privileges, drag the old SpamSieve to the trash and empty it, and then drag the new one into the Applications folder. Then launch SpamSieve, followed by your mail program.
Mailsmith users should make sure that Use SpamSieve is still checked in Mailsmith’s Spam Handling preferences.