Windows 10 Home - "Unauthorized changes blocked"

THANK  YOU!!!  This worked perfectly!

Open Windows Defender Security Center

Click Virus & threat protection

Click Virus & threat protection

Scroll down to the bottom then toggle off Controlled folder access

Try again

This answer fixed multiple "unauthorized changes to controlled folder" notifications I was getting.  I hope it actually isn't still blocking things, and just not notifying.

Use the Windows Defender Security app to enable Controlled folder access

1. Open the Windows Defender Security Center by clicking the shield icon in the task bar or searching the start menu for Defender.
2. Click the Virus & threat protection tile (or the shield icon on the left menu bar) and then the Virus & threat protection settingslabel:
3. Set the switch for the feature to On

https://docs.microsoft.com/en-us/windows/threat-protection/windows-defender-exploit-guard/enable-controlled-folders-exploit-guard

Rather than, turning it Off, please consider using 'Controlled folder access' and becoming familiar with this Win10 enhancement to protect your safety and security.

see also:

https://docs.microsoft.com/en-us/windows/threat-protection/windows-defender-exploit-guard/controlled-folders-exploit-guard

Also, consider turning on PUP protection in Windows Defender:

PUA Protection is disabled by default and needs to be enabled. This is easy with PowerShell – just run this command line at the elevated PowerShell Prompt:

Set-MpPreference -PUAProtection 1

Then confirm that the value was reset by returning the current state for PUAProtection:

$Preferences = Get-MpPreference

$Preferences.PUAProtection

https://answers.microsoft.com/en-us/protect/forum/protect_defender-protect_scanning-windows_10/windows-defender-not-detecting-known-adware/9cfe114b-8d1b-42a2-8268-34dc3acf9390?auth=1

from GreginMich 's post.

I have been fighting my computer for two days trying to install an Autodesk program. Finally, someone has given me the solution, Thanks!