Zotero Folder Import add-on installing

When I want to install the x plugin in Zotero, I get the "The add-on "%S" could not be installed. It may be incompatible with this version of Zotero." error. I am using version Ztero 6.0.26. I wonder if it is not possible to install this add-on on this version or am I doing something wrong?
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