Sorry - "enable guest checkout" is actually not enabled
Well can you please check if the related order is marked as complete in the back end woocommerce-> orders page ?
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1. Well this is coming from buddypress and it does asks for activation key. if you do not want this please create cusrom registration forms :
https://wplms.io/support/knowledge-base/custom-registration-forms-in-wplms/
2. please create a new topic and share your site url and admin credentials there in private reply to check this.
3. Well this needs to mark complete orders .
to mark complete orders autmatically :
https://wplms.io/support/knowledge-base/auto-complete-woocommerce-orders/
PS : please create a new topic as your issues are not in context with this topic .