Install packages required for versions below 12

For Angular version below 12, you can use the legacy (ngcc) package of the Syncfusion^® Angular components. To download the ngcc package use the below.

Add @syncfusion/ej2-angular-pdfviewer@ngcc package to the application.

npm install @syncfusion/ej2-angular-pdfviewer@ngcc --save

To mention the ngcc package in the package.json file, add the suffix -ngcc with the package version as below.

@syncfusion/ej2-angular-pdfviewer:"20.2.38-ngcc"

Note: If the ngcc tag is not specified while installing the package, the Ivy Library Package will be installed and this package will throw a warning.