After installing DS Client 4.2.12.2235 on a Windows 10 PC, I launch it and it starts to load then ends before the login window opens. In the application log Windows is logging this:
Faulting application name: AL_Designer.exe, version: 14.2.12.2235, time stamp: 0x5cbd8e00
Faulting module name: ucrtbase.dll, version: 10.0.18362.387, time stamp: 0x4361b720
Exception code: 0xc0000409
Fault offset: 0x000000000006db8e
Faulting process id: 0x2e94
I have previously installed the same client version on another Windows 10 laptop and that works. I have compared the size and datestamp of the ucrtbase.dll on the two machines and they are identical. I have also tried installing all the same versions of the MS Visual C++ redistributables as are on the machine that is working, and no luck.
Take a backup of %LINK_DIR%\bin\CreateDemoCerts.bat on Windows or $LINK_DIR/bin/CreateDemoCerts.sh on UNIX.
Edit %LINK_DIR%/bin/CreateDemoCerts.bat on Windows or $LINK_DIR/bin/CreateDemoCerts.sh on UNIX and change the value of VALIDITY_DAYS from 10950 to 9125.
Take a backup of folder %LINK_DIR%\ssl on Windows or $LINK_DIR/ssl on UNIX.
Remove all the existing files under %LINK_DIR%\ssl\server on Windows or $LINK_DIR/ssl/server on UNIX.
Regenerate SSL certificates using %LINK_DIR%\bin\CreateDemoCerts.bat on Windows or $LINK_DIR/bin/CreateDemoCerts.sh on UNIX.
If you are on server machine then Recreate/resync the job server. For Designer client machine, just run designer.