Windows Service C# Automatic Update

I am a developer, I build a software for backups but i need some help to do complete my software. I decide to split in 2 parts (one is my part a DLL or EXE) and the other one is athe Windows service. When: Starting when you want, deadline at 30 August How: Source Code included, File installable included, clean code :-) , not use library without licence Technologies: C# / Windows Service What: Create a Windows Service(should work without User Login): It execute a DLL method or an EXE (we can discuss about it) with a scheduling (from 1 hour to 7 days) Auto-update the DLL/EXE, check a specific Internet address, when there is a new version the service download the new DLL and install them (example Json/XML on the bottom) Block execution after 12 hours if is not finish Update DLL/EXE when a new version is ready Other info: JSON example (no login, is public address): { “dllVersion”: “3.4”, “downloadDllLink”: “[login to view URL]” // zip or rar or 7z or other } Please specify eventually restriction or choice.