Okay, 41 is not an error code I've seen, but the message suggests that, for whatever reason, Windows isn't able to make a secure verification of the installation files, and so it's not letting it go through.
Some more questions (just what you wanted, right?
):
- Does your computer meet all system requirements—After Effects System Requirements—including being a 64 rather than 32 bit version of Windows 10 (How Do I Know if I’m Running 32-bit or 64-bit Windows)? After Effects only works with 64 bit.
- Do you have antivirus software running? If so, temporarily disable it and try installing again. Same thing goes if you're behind a firewall.
- Are you trying to install from the Creative Cloud desktop app or directly from Adobe After Effects CC | Visual effects and motion graphics software. What happens if you try the method you haven't been using?
- Have you ever had AfterEffects on this computer before?
- Do you currently or have you in the past had other Adobe software installed?
There is also this forum thread where someone was able to work around Error Code 41 with a little task manager wizardry: Felkod 41 / Error code 41. The situation isn't exactly the same, but it may help.
Finally, if none of that fixes the issue, you can try to pinpoint exactly what's going wrong by following the steps in Troubleshoot Adobe Creative Cloud install issues with log files.