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# When first run D5, why prompt 'Cannot continue executing code because Qt5Core.dll was not found.'

<figure><img src="/files/UZGrZnPENh3QABPA6z4g" alt=""><figcaption><p>Qt5Core.dll</p></figcaption></figure>

It may be caused by the following:&#x20;

1. The download package is incomplete, we recommend using Chrome or edge browser to download.
2. Third-party decompression software lost files during decompression. We recommend using Windows official decompression or 7-zip.
3. There is no permission for the current directory where D5 is installed. When confirming the change of installation, install on a different disk.