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I have the older version of Harry's filters, I'm using PSP7.04. I intend to download Harrys Filters V3.0, now to my question, lol.. should I uninstall the older version before I install the new version? Just curious. Thanks in advance for any and all help

You don't need any older version. Just install Version 3.0. If you have a previous version installed, you should remove it.