Good idea - better safe than sorry. Its definately 3rd party...........the question is, can you trust it?
What did you scan it with?
If you really want to use it, do yourself a favour and scan it with these on-line scanners:
1. ESET Free ESET Online Antivirus Scanner
2. Virus Total VirusTotal - Free Online Virus, Malware and URL Scanner
3. Threat Expert ThreatExpert - Automated Threat Analysis
4. Virus Scan http://virscan.org/
Some of these have a limit to the size of file you can upload.
Let us know what you find, or if you need more help.
EDIT : I scanned the web host with NIS2011 and it reports as safe, but that doesn't neccessarily apply to the downloads hosted on it.