Always verify the checksum of your downloaded file. The biggest risk of Ultrasoft isn't the software itself—it's the fake "Ultrasurf Pro" malware floating around on third-party downloaders.
Here is the part most blogs skip. Ultrasurf has a controversial history. ultrasurf for pc
Upload usurf.exe to VirusTotal. You will see 5–10 detections (usually "PUP" or "HackTool"). This is mostly false positives due to its packing and obfuscation. However, because it injects into browser processes, it technically behaves like malware. Do you trust the publisher? That’s your call. Always verify the checksum of your downloaded file