False positive on Zotero

When installing free app Zotero, Unchecky changes the Setup Type radio button from Standard To Custom, and reports a false positive of a potentially unwanted program when installing Zotero. There is no PUP present in the installer.

Download page (choose Standalone): https://www.zotero.org/download/
Direct link: https://download.zotero.org/standalone/4.0.28/Zotero-4.0.28_setup.exe