While installing the Atera agent on a Windows device, you may encounter error codes 2203, 2502, or 2503. This article walks you through the steps to resolve these installation errors.
Re-generate the MSI Installer
The MSI package might be corrupted or outdated.
Create a new MSI installer from your Atera account.
Run the new installer on the affected device.
Note: Always use the latest generated MSI to ensure compatibility with your Atera account and device settings.
Check Folder Permissions
These errors often occur when Windows can’t access the C:\Windows\Temp folder.
Verify permissions as follows:
Right-click C:\Windows\Temp → Properties → Security.
Confirm that SYSTEM and Administrators have Full Control.
Adjust permissions if needed, then retry the installation.
You can also fix permissions automatically by running this PowerShell script as Administrator:
# Run this script as Administrator
$folder = "C:\Windows\Temp"
# Take ownership
takeown /f $folder /r /d Y
# Reset ACLs
icacls $folder /reset /T
# Grant SYSTEM full control
icacls $folder /grant SYSTEM:(OI)(CI)F /T
# Grant Administrators full control
icacls $folder /grant Administrators:(OI)(CI)F /T
# Grant Users modify rights
icacls $folder /grant Users:(OI)(CI)M /T
# Confirm changes
icacls $folder
Run the Curl Installer with Admin Rights
Make sure the installer runs with elevated privileges:
Open Command Prompt as Administrator.
Run the curl installer command provided by Atera.
Note: Running with admin rights ensures the installer can write files and perform required system actions.
Verify the .NET Framework
The Atera Agent requires .NET Framework 4.5 or higher.
To check the installed version:
Open PowerShell.
Run a command or script to confirm the .NET Framework version.
If it’s below 4.5, install the latest supported .NET Framework and retry installation.
Run the Cleanup Script
Old or incomplete agent installations can block new setups.
Run the cleanup steps from: How do I remove the Atera Agent after my trial has expired?
Restart the device after cleanup.
Reinstall the agent.
Disable Geo Proxy (If Needed)
If the issue persists, temporarily disable any geo proxy settings or VPN services.
In some regions, proxy routing may interfere with installer communication and cause these errors.
