1) Download the installer http://www.srim.org/SRIM/SRIM-2013-Std.e
2) Download The Unarchiver http://wakaba.c3.cx/s/apps/unarchiver.html
3) Rename SRIM-2013-Std.e to SRIM-2013-Std.exe
4) Open SRIM-2013-Std.exe with The Unarchive to extract it
5) Visit https://www.codeweavers.com/compatibility/crossover/microsoft-visual-basic-5-runtime and click Install Now
6) Install into a new WinXP bottle and name the bottle "SRIM 2013"
7) Click the Bottles button in the top-left of Crossover, select the SRIM 2013 bottle
8) Double-click Run Command, Browse to the SRIM-2013-Std folder and select the SRIM.exe and run it.
You can use https://www.codeweavers.com/support/wiki/mac/mactutorial/create_launcher to create an app icon too.