It's clear. So I can't see any solution to my problem. Could you suggest me any workaround? Maybe I could skip the mid-course short quiz requiring xlsx engine, but do you know if there is something concerning xlsx engine required in the final test? I'm not a real novice in using SAS (I use it for 3 years for my job), so if xlsx engine could be skipped temporarly but I could be able to go further over the online course, for me it would be fine. In the meantime, I wrote curriculumconsulting@sas.com as you suggested, I'll let you know their reply.
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