Use tools like VirusTotal to check the archive and its contents.
Review any readme.txt or install.nfo files included in the archive for specific setup instructions. Launch idaq.exe (32-bit) or idaq64.exe (64-bit) to begin. 8, or perhaps a for a specific platform? IDA 6.8.rar
Never run unknown binaries on your host machine; use a dedicated virtual machine (VM). Use tools like VirusTotal to check the archive