An unexpected error occurred while unpacking files in ArcGIS Pro. Error code -6

Error Message

When attempting to install ArcGIS Pro, the installation fails and the following error message is returned:

Error:
An unexpected error occurred while unpacking file(s). Error code: -6

The following is a non-exhaustive list of products that return the error message:

• ArcGIS Pro
• ArcGIS License Manager
• ArcMap

Cause

• The account installing the software does not have read and write permissions for the specified installation folder.
• Windows firewall is preventing the installation.

Solution or Workaround

Note: 
The following workarounds may require a Windows administrative account.

Assign read and write permissions to the account installing ArcGIS Pro

1. Right-click the installation destination folder and select Properties.
2. In the <folder_name> Properties dialog box, select the Security tab.
3. Under Group or user names, click Edit....
4. In the Permission for <folder_name> dialog box, select the username or group performing the software installation.
5. Under Permissions for <user_name>, uncheck the Read and Write check boxes in the Deny column.
6. Click Apply.
7. Click OK to close the Permissions for <user_name> and <folder_name> Properties dialog box.

Note:
Alternatively, create a new folder or select a different folder as the installation destination folder.

Temporarily disable Microsoft Defender Firewall

1. Disable Microsoft Defender Firewall. Refer to Microsoft: Turn Microsoft Defender Firewall on or off for instructions.
2. Proceed with installing the software.
3. Enable Microsoft Defender Firewall. Refer to Microsoft: Turn Microsoft Defender Firewall on or off for instructions.