HOMER Energy Support

This installation package could not be opened Error

Last Updated: Aug 15, 2017 02:34PM MDT


Error: "This installation package could not be opened. Contact the application vendor to verify that this is a valid Windows Installer package."



Error when installing HOMER Pro.



The error may come from different reasons:

  • Corrupted or damaged file when it was downloaded.
  • Installing a file saved in a network and not in the local computer.
  • No Administrator rights in the computer account.
  • Anti Virus blocking the installation.
  • Windows Installer problem.
  • A Registry Settings cause.



1. Download again HOMER Pro. Do not store it in a network drive, store it in the local computer.

2. Once the file is in your local computer, right click it and choose Properties In the Properties dialog, click Unblock (if the button is present).

3. Ensure that the computer account has administrator rights.

4. Double click and try to install it, if it still fails:


Deactivate Anti Virus temporarily

Deactivate the Anti Virus/ firewall temporarily and try the installation again, if it fails:


Verify the Windows Installer

The Windows Installer service adds, modifies, and removes any applications that are provided as an .msi package. If this service is disabled any services that depend on it will fail to start.

To verify that the Windows Installer service is running and to enable it if it is not, follow the steps below:

a) Press the Windows key + R, type Services.msc into the field and press Enter.

b) Locate the Windows Installer service in the Services window, right-click it and select Properties.

c) Select Automatic from the Startup type drop-down and click Start.

d) Click OK and try the installation again. If you receive the same error message, the Windows Installer service could be corrupted.

e) Download and install the last version of Windows Installer: http://www.microsoft.com/en-us/download/details.aspx?id=8483

f) Try the installation again.


Verify the Registry Settings

1. Open the Registry Editor:

Windows 8:

1. Open to or change to the Start menu screen.
2. Type: REGEDIT (this will show in the Search page).
3. Press the Enter key on the keyboard.

Windows 7

1. From the taskbar, click on the Start button.
2. Directly above Start, type: REGEDIT.
3. Press the Enter key on the keyboard.

2. Click Yes in the User Account Control dialog if necessary

3. Browse to:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem

To do this, click the triangle or plus sign next to each item listed until you get to FileSystem

4. Click on FileSystem to display its contents in the right pane of the Registry Editor

5. If the value for either the NtfsDisable8dot3NameCreation DWORD or theWin31FileSystem DWORD is not 0, right click the DWORD, choose Modify, and set the value to "0".

6. After closing the Registry Editor, try the installation again.

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