Several ideas that might help.A downloaded file receive a "blocked" attribute. I ignore if that propagates to files that the instaler expand and copy.
The second thought I had is that you are using a portable installation, that you can test it on Windows 7.
I remember that some operations require java and for portable programs is preferable portable java. That is true for the assistants (letter, fax, agenda, presentation ...) and for the options on the start up panel "Writer Document", "Calc book", etc for new documents. But the menus (file - new - type of document) works well without needing java.
Also, LibreOffice web page warns about the compatibility of 32/64 bits versions with processors of 64 bits. Is your version compatible?
Windows 10 has also preference to MS software and probably and have been mentioned that alternative software rutinously are having problems with Windows 10.
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