The answer depends on what you changed, but the easiest way is to provide a patch that should be installed after the normal installation of dnn. For example, if you just changed the dll, you might be asked to follow the normal instructions for installing dnn and finally move the dll. If it is larger than the file, you can see how the dnn service pack is built. It follows the same folder structure and places only modified files. Therefore, if you have several DLLs in the bin, they will be placed in the bin folder, and if you changed any ascx file, it should be placed in the same path, creating the same folder hierarchy.
You can also create a package that you can install to deploy the changes, but for a smaller set of files it will complete.
Let me know if you need more help.
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