Should we activate both free and pro versions ?

Hello @bing4,
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Thank you for contacting Rank Math support.
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Yes, the Rank Math PRO version is built on top of the free version to keep the plugins robust and lightweight.
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You will need both of them to be installed and activated at the same time so the PRO version will work.
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Here’s a guide you can follow as well:
https://rankmath.com/kb/should-i-delete-free-plugin-after-upgrading/
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Looking forward to helping you.