is it safe to download ziprar.dmg

Pitchofcase seems to be best avoided. See this article. How to get rid of Search.pitchofcase.com Redirect (Mac) - Virus removal guide

When downloading software, be sure to go to the developer's site, as other sites can package malware with the software you want.

Hello Mary,

The key to the advice you already have is from where are you trying to download this file. If you can tell us exactly what you are trying to download and from where, we can advise you how to approach it.

If for some reason you prefer not to say, the advice of only downloading from the original developer's site should be heeded. Sites like Softonic, cnet.com and the like are a total no, no.