paralells being marked as a virus by browsers

hi, I'm having trouble downloading a custom theme installer package for Parallels as my antivirus software keeps flagging it as a virus. Does anyone know of a safe way to download and install custom themes for Parallels without triggering a virus warning?

 

Could you provide a bit more information? eg,

What AV are you using?
What version is it?
Exactly what "Customer Theme installer package" are you referring to?
What version is it?
What Hardware are you talking about? x86 or Mx series?

Putting a bit more info into your requests would help immensely.