Import Failed ninja script add on

I downloaded ninja 8 8.1.6.0 64-bit and also downloaded ninzarenko zip file from https://ninza.co/download-zone V7.0 . when i add it to ninja i get a error that says import failed. The ninja Script Archive file may contain duplicate method names that already exist on your PC., modify a method signature that other scripts were dependent on, or be missing a required file on either your PC or in the import file. could you let me know if there is something i can do on my end.