Hello,
We cannot provide solvers (DEV or specially compiled solvers) via the Ansys forum. Please submit a service request on the Ansys customer portal:
support.ansys.com
You will find the following R9.3.1 solver on the download page:

https://lsdyna.ansys.com/downloader-filter/
username: user
password: computer
Maybe this works for you.
Reno.