The installer is split into 3 files because it exceeds GitHub's 2 GB asset limit.
All three files must end up in the same folder, then double-click Setup.exe.
Step 1 / 3: subMatik_v1.9.2_Setup.exe (3 MB launcher)
Step 2 / 3: subMatik_v1.9.2_Setup-1.bin (1.9 GB)
Step 3 / 3: subMatik_v1.9.2_Setup-2.bin (166 MB)
Trouble? Use the patch if you already have v1.9.x installed.