You can export a library from the library manager of a project or from the library repository and then save it as a file to the hard disk.
Export from the library manager
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Open a library manager of an application in a project.
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Select a library in the library manager.
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Click the export command in the context menu.
The “Export Library” dialog box opens.
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If the selected library is linked in the project not only as a compiled library, but also in source format, then both file types are in the drop-down list for “File type”. Otherwise, the filter automatically shows the available type: "
*.libraryor*.compiled-library. - 
                           
Select the file type and storage location and click “Save”.
 
Export from the library manager
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Open the CODESYS library repository (“Tools” menu).
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Select a library version in the window of the installed libraries.
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Click the “Export” button.
The “Export Library” dialog box opens.
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As step 4 and 5 for "Export from the library manager".