CM Downloads Manager plugin is currently localized for the following languages which appear here. To use the version of CM Downloads Manager in your preferred language, you first need to use the localized version of WordPress. If you would like to localize the CM Downloads Manager plugin for other languages that do not appear in this list, please contact us and we will help you in this process.
You can also use an online converter from po to mo found here
Notice: once you translate using the online converter make sure the file name looks like this: cm-download-manager-pro-de_DE for Pro version or cm-download-manager-de_DE for free version. The de_DE stands for the language code which can be taken from here