Hi @Tahreem,
downloaded from this link -> https://dl.enpass.io/beta/portable/mac-win/6.0.7/EnpassPortable_6.0.7.zip is a zip, unpacked the Mac directory contains another zip EnpassPortable.zip which unpacks to a single app EnpassPortable. The executable in Contents/MacOS ist dated Donnerstag, 28. März 2019 um 18:07. From disk it cannot be opened at all, from a stick again I get told the file is corrupted and should be moved to trash. I moved the zip to a stick, unpacked there, same result. After all it's not a pkg (which would make no sense since installing a portable version is useless), and after it all it does not run on Catalina.
Thanks for caring