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The file 'C:\Windows\Installer\22996aa.msi' is not a valid installation package for the product Check_MK agent. Try to find the installation package check-mk-agent-v1pvq1 in a folder from which you can install Check_MK agent.

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1. Remove the corresponding Registry (delete the entire folder): Computer*\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Check_MK_Agent*
   
   

2. Stop the Checkmk Agent Service

   Code Block
   language powershell theme RDark
   net stop Check_MK_Agent #(for CheckMK Agent 1.5) net stop CheckMKService #(for CheckMK Agent 1.6 and 2.x)

   
   

3. Remove the Directory  "C:\Program Files (x86)\check_mk"
   • In Control Panel "\Programs\Uninstall a program" you will find one deprecated entry for Check_MK Agent
     
     
4. Download the troubleshooter for removing this entry:
   
   • https://support.microsoft.com/en-us/help/17588/windows-fix-problems-that-block-programs-being-installed-or-removedLink to download the troubleshooter

   • Uninstall CheckMK Agent with the troubleshooter

     
     

     1. Open the uninstallation program
        
        .
     2. Click Next
        
        .
     3. Click Uninstalling
        
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     4. Select your Checkmk Agent and click Next
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     5. Click Yes, try uninstall
        
        
        
     6. Click Close the troubleshooter
        

     
     

5. Reboot

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