Installation error Zotero plug in for Libre office

My Libre office version is 5-4, Zotero 5, JRE 1.8_161
My installation of the Zotero plug in for Libre Office fails although I tried all the solutions proposed on the Zotero website []
After having clicked the Manual Installation button, as it open a folder containing the integration component to be installed within LibreOffice itself, when I Double-click this component to install it, I see this message " an error occured during file opening".
I have tried two or three times reinstalling Libre Office, JRE,
What can I do ?
As I visit the web site of Libre Office, on this page []

I find the information
Zotero LibreOffice Integration

Current Release :No stable release available yet.
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