There's nothing wrong with the file. It's just flagged for the reason Leo mentioned. You just need to add it to the exclusion list in your anti-virus.
For Windows Defender, you can look for the detection entry and choose to allow it. Or, just temporarily turn off real-time protection.
For example though, in the registry at "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths", there's a dword set to 0 with the name of C:\Users\myusername\Downloads\operapassview\OperaPassView.exe that was created when I added the exe to the exclusions list in Defender's settings. But, I had no problem downloading it in the first place as real-time protection was off.
@andreimattponayadf Still, Opera has my trust, as much as they want to protect the privacy of their users, they're located in California and thus, affected by the American jurisdiction. If I were paranoid, I would prefer that the Chinese had my info instead of the Americans. But I am not, and to being honest, I don't care; Opera works for me, I feel more secure using it than Chrome, and has more features than Firefox. So far it hasn't let me down.