The pbpBB application doesn't work with PHP 7.3, that's why we include that validation in our module to avoid its installation. You can use any other PHP version (7.1.x or 7.2.x) to install the application on top of WAMP. To achieve that, you will need to uninstall the WAMP solution from your computer (if you don't have any data) and install any of the other versions we provide in bitnami.com. After that, please install the phpBB module on top of it.
PS: You can also install the Bitnami phpBB stack that you can find here
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