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How to solve thisthis installation package could not be opened. contact the application vendor to verify that this is a valid windows installer package.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(300.8, 46%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYZ%3C/text%3E%3C/svg%3E)
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How to solve this problem' installation package could not be opened. contact the application vendor to verify that this is a valid windows installer package.' I had downloaded the QGIS software and when tried to open the file, it pop up this message.
Microsoft Security | Microsoft Defender | Other
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(300.8, 28.000000000000004%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECK%3C/text%3E%3C/svg%3E)
Catherine Kyalo 3,180 Reputation points Microsoft Employee2026-04-16T15:52:23.5466667+00:00 Did you confirm that it is .exe or .msi windows installer package?
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