Issue with Upgrading from v4.4.2 to 4.7.18

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I'm trying to upgrade my InvisionCommunity forum from version 4.4.2 to 4.7.18, but I'm encountering issues with PHP compatibility.

When I switch to PHP 8.1 (which is required for 4.7.18), my forum stops working, and I can't access the admin/upgrade page. On the other hand, without switching to PHP 8.1, I can't proceed with the upgrade.

I'm stuck and unsure how to move forward with this upgrade. What steps should I take to successfully update from 4.4.2 to 4.7.18? Any advice or guidance would be greatly appreciated.

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