Hi Mike,
Thank you for renewing and posting here. I assume you are referencing League Manager Addons, not the free version of League Manager (if not please advise).
I do not believe the problem is the version of LM Addons. As I recall, your site is running PHP 8.0 and that is the problem. I am in the process of re-testing all the MSTW plugins on PHP 8 (My test server is running 8.0.22 at the moment). I am finishing MSTW Schedules & Scoreboards right now. MSTW League Manager and the Addons are next on the list. I do not know how long the re-testing will take. I hope not long. Most of the issues are simple deprecated constructs/syntax that stop WP, but are easy to fix. Some turn out to be quite nasty though.
In the meantime, the only work-around I can offer is to back down to PHP 7.x. I am confident that will solve your problems.
I wlll post on this thread and post on shoalsummitsolutions.com (which will generate e-mail if you are signed up) when this is corrected.
Regards,
-Mark