Have you first tried to remove, and uninstall the previous version of the Horizon App which has been installed on your OS as well ?
Kindly try to re-download and install HORIZON from scratch. Make sure to run HORIZON as an ADMIN/Administrator.
It might be possible that there are still some missing/corrupt registry entries on your system, though I’m not jumping to any conclusion, as of now.
But, use a REGISTRY cleaner tool to fix any errors, if need be.
Are you on a Virtual machine/BOX, or the like, or you are using a shared system folder ?
Just asking, because make sure you have full Administrative rights to do any ask (Turn off UAC/User Account control).
Give this a read, just for reference:
Only download Horizon from WEMOD’s official webpage, as given below. But before you re-install HORIZON, kindly remove and manually delete all previous versions of the app from your system.
Remove folders under the APPDATA path and directoty. C:\Users\Your- Windows USERNAME\AppData\local\ Daring__Development__Inc
Anyways, if you already have .NET Framework 3.5 properly installed, and configured on your system as well, then the horizon app might be getting blocked by some other software, or in some cases the file could also be corrupt.
Else, there might be some interference with the Horizon tool on your system, which is preventing it from opening.
Open the TASK MANAGER and check what other processes are still running in the background, when you launch HORIZON. Are you using any Wi-fi connection as well ?
Check the modem/router firewall settings, if need be. If you still continue to face this issue, then it could be an OS issue, and/or it could also be related to Cached Installer problem in some cases.
Assumption, might not be fully relevant in your case, but give it a read, if you face any issue while installing and running the horizon app.
If suppose, Windows OS cannot properly load the Setup.msi file, then either the flle is corrupt/missing, and/or is infected with a Virus or malware (in some cases), and can sometimes prevent apps from being loaded.
Corrupt Windows registry keys can also sometimes attribute to this kind of error. If the Windows Installer engine is corrupt, disabled, or installed incorrectly, this may cause any program installation issues.
An MSI is a Windows Installer database.
Windows Installer (which is a service installed with Windows OS), uses this to install software on your system (e.g. copy some files, set registry values, among other things).
The Windows Installer package/file might also be corrupt in some cases.
Make sure .NET Framework is also properly installed, and/or configured on your system as well, and you don’t have any corrupt downloaded “Horizon” file.
Make sure that the Windows Installer service is also not set to Disabled.
This can be checked by typing services.msc in the Search box, or just click Run then type services.msc in the dialog box. The Windows Installer Service might be having a DCOM permission level problem, or a registry.
sorry for typo errors…