This source or project is not dead. It is a good base. If you know unity and C++, its not that hard.
1. Upgrade the source to a unity version known to support 64bit android SDK. 2017+ its up to you
2. Recompile all libraries both client and server. since this source only has 32bit precompiled libraries included
3. Most of the library source is already included in the client and server source. the rest are easy to find in the internet
4. Your only problem is to create and extend the Xmainclient.dll as its already compiled to DLL
I can guarantee you 1000% this works on every unity version above 2017+ and that this source 1000% works on any android version even android 17, even IOS. Just focus and read the error console carefully.
NOTE : the precompiled windows server exe is faulty. You will need to fix some server source related stuff to fix the crashes.
If you love DNM, just dont give up and continue studying the code base. stop fully relying on AI. assist is fine.