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I installed Arx Libertatis, but when i try starting the game i get this error: error

i have Arx Fatalis 1.21 from Steam, installed latest version of Arx Libertatis from Download page (arx-libertatis-1.2.1-windows.exe) i didn't install the patch since i'm not able to do, i've seen that the patch is already installed with the steam version in some forum post.

here is what the arx.log says:

I Startup:163 Starting Arx Libertatis 1.2.1 I ArxGame:342 Using config file "C:\Users\Anounymous\Saved Games\Arx Libertatis\cfg.ini" I ArxGame:289 Changing filenames to lowercase... I SDL2Window:191 Using SDL 2.0.20 E SDL2Window:346 Ignoring Desktop OpenGL context version 1.1.0 - not enough texture units available: have 0, need at least 3 E SDL2Window:349 ├─ Vendor: Microsoft Corporation E SDL2Window:350 └─ Device: GDI Generic E SDL2Window:346 Ignoring Desktop OpenGL context version 1.1.0 - not enough texture units available: have 0, need at least 3 E SDL2Window:349 ├─ Vendor: Microsoft Corporation E SDL2Window:350 └─ Device: GDI Generic E SDL2Window:283 Could not create OpenGL ES window: Could not initialize OpenGL / GLES library CRITICAL ArxGame:471 Graphics initialization failed CRITICAL Core:249 Initialization failed I ArxGame:993 Clean shutdown

please help!