You need to add LibreOffice to your antivirus’ Allowed list. The bit you need to add is soffice.bin , this page for Microsoft defender/windows security can help find soffice.bin for you. You will need to use your own antivirus methods for adding it though. Cheers, Al
Likely @EarnestAl had this FAQ in mind writing “this page for Microsoft defender/windows security” 
Or something similar.
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I forgot to paste the link. Thanks Mike