Scrambler, I’ve cloned https://sirinc.org (4.4.8) to https://sirinc.org/test and updated it to 5.0 for your review. Let me know if I can help further.
Alan
Moderator comment: Because WP now lets you upload and overwrite themes easily, upload V4.4.8 found as Weaver Xtreme 4.4.8 Final version at https://weavertheme.com/archive-downloads/. Installing Weaver Xtreme V5 never touches any of your previous V4 settings, so you can revert at any time, and trying V5 again later will re-perform its conversions.