the github says This file may contain malware and the automatic download has been disabled，and the file is too old now.i think new wallet may be needed
If you can tolerate the informality, I have an MXE cross-compiled Windows binary available. All I had time for was to check that it runs on a Windows 10 VM, mind you. And I couldn't manage to successfully compile the qrencode facility, so I had to disable it
pro tem.
https://minkiz.co/noodlings/dtc/datacoin-qt.exe
Cheers
Graham