Isaac and I (the developers of UBB.threads) utilize XAMPP for backdating/changing PHP builds without having to modify a hosting environment; which results in more dedicated resources for imports and some upgrades. They have a great
version comparison page which outputs what Apache/PHP/MySQL versions each one of their builds supports, so one could say download one which supports PHP5 and another which supports PHP7 and copy files/databases around.
Upgrading the importers isn't a simple install and go task, and we developers are working on the future of the product; the importer scripts are ancient and are not something we have even attempted to tackle as we're swamped with PHP7/PHP8 and rewriting the codebase for supporting modern servers.