If you already have an ISO from an unknown source, do boot from it directly. Instead:
Cybercriminals know that people search for "index of" files. They deliberately set up fake open directories. They will upload an ISO named AcronisTrueImage.iso that is, in reality, a ransomware dropper, a keylogger, or a boot-sector virus.
Open the application, go to Tools , and select Rescue Media Builder .
If you are migrating to new hardware or your current OS is corrupted and you don't have the software installed to build the media, log in to your Acronis account portal via a web browser. You can usually download the latest bootable media ISO directly from your account dashboard without needing a working OS installation first.