If an error is returned you need to double check the installation steps. Run LOOT outside of MOand sort your load order. I have a Steam version but I get application load error 5. If I use the 4gb loader it wont load nvse. This enables support for 4GB LAA, Multi-core and Threading. Having trouble extracting the archive, or is Windows telling you that nvse_loader is not a valid application ? When your mod loads, use the command GetNVSEVersion to make sure a . NVSE loader can work with the 4GB enabler too, you just have to set . Here is how to identify what this AppID is and apply it. Normally this error indicates the Steam Client app. If I try to play just fnv it seems to load fine if I start a new game. Patches exe with FNV 4GB patcher (if you want to play with HQ texture mods etc.). I suppose I could try just running the Steam 4GB mod. Hope You Enjoyed◅◅ ▻Consider Subscribing For More Fixes? So I am reloading F: NV with NO mods and aim to grab the new California. I run it I also see application load error. NVSE and F: NV 4GB patch dont start and throwing this error at me. I had this error with my game a week or so ago, thx to the magick of Steam.