When I try to open that "Custom" thing (I suppose it's workshop), I always get the following crash:

An error has occurred. If you continually get the same error, try loading a different save file, submit a bug report, and/or check the Support Forums for assistance.

POSTAL 2 Build Apr 17 2023 17:34:38

OS: Windows NT 6.2 (Build: 9200)
CPU: GenuineIntel PentiumPro-class processor @ 2496 MHz with 4095MB RAM
Video: Intel(R) UHD Graphics (1081)
Level: Startup.♥♥♥ - Untitled

General protection fault!

History: ULinkerLoad::VerifyImport <- ValidateImports <- ULinkerLoad::Verify <- ULinkerLoad::ULinkerLoad <- UObject::GetPackageLinker <- (Core.Class quadbarrelscript.LoconMut NULL) <- UObject::StaticLoadObject <- (InteractionMaster Transient.InteractionMaster0, Function Engine.InteractionMaster.Process_KeyEvent) <- UObject::ProcessEvent <- UInteractionMaster::MasterProcessKeyEvent <- UEngine::InputEvent <- UWindowsViewport::CauseInputEvent <- UWindowsViewport::UpdateInput <- UViewport::ReadInput <- APlayerController::Tick <- TickAllActors <- (NetMode=0) <- ULevel::Tick <- TickLevel <- UGameEngine::Tick