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

<figure><img src="https://3611830798-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MjbN1iGmN_HBnj_fyU9%2Fuploads%2FOIKEz2bWSpLNlT5HD9Mq%2Fimage.png?alt=media&#x26;token=42e79f9a-1774-4e81-a6ec-2433618564ac" 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.