What should I do after accidentally downloading a suspicious program?

Just a heads up, make sure to always check the URL before downloading software. It’s easy to get tricked by similar names. If you haven't, uninstall any potentially suspicious programs right away, and definitely run a comprehensive malware scan. You might want to consider enabling some extra security features in the future, like two-factor authentication for your accounts, just in case!

If you're worried about potential malware, it's smart to take action. Even though you didn't complete the installation, running a full, in-depth scan with software like Malwarebytes alongside Windows Defender is a good idea. Also, consider changing your passwords for any critical accounts, just to be safe. Since you didn't fully install anything, you might be okay, but better safe than sorry! And next time, stick to official sources like OrcaSlicer.com or GitHub for downloads.

Sounds like you caught it just in time! Make sure you're using an admin account to have better control over installs. Since the User Account Control (UAC) prompted you about the unknown publisher before you opened it, that's a good sign you acted quickly. Just follow up with those scans and keep an eye on your system to be sure everything's running smoothly.