Your system date is likely wrong. Open Terminal from the Utilities menu and type: date 040101012019 and press Enter, then try installing again.
Restart in Verbose Mode (Cmd+V) to see what is hanging. Mac_OS_10.14.4_Mojave_DVD_Mult...
To make this guide more tailored to your situation, are you installing this on: A (direct upgrade)? An unsupported Mac (using patches)? A Virtual Machine (VMware/VirtualBox)? Your system date is likely wrong
The disc might be burnt incorrectly or the drive is failing. Use a USB drive if possible. Mac_OS_10.14.4_Mojave_DVD_Mult...
Installing an OS can cause data loss. Use Time Machine.