Hi JC
Xploid mod has not been (to my knowledge) updated beyond v4.0 which was still unfinished and had some issues like characters and guns not working which stopped it from becoming something big.
I did try Xploid mod with an older version of FPSC and got a basic scene working with dynamic shadows but it had too many bugs to make an actual game. Also Xploid mod only works with FPSC v1.15 or v1.16 so it probably isn't compatible with v1.20.
Here is the last official Xploid trailer that I've seen:
If you really want to try out Xploid or Corvus mod which both have dynamic shadows, I've uploaded them for you. As I said before you will probably need to use FPSC v1.16 for them to work at all.
http://www.mediafire.com/download/6a4zad2wcs64fe8/FPSC_Mods.zip
Here is the offical developer site for Xploid mod. The latest version for download says v3.0 but I've uploaded v4.0 for you.
http://xploid.webs.com/