I don't know, but I doubt it's because of the available size on your c drive, how much RAM and VRAM do you have? If it's struggling with a 15gb model, try to download a quantized model instead, a Q4 would be smaller and still produce nice results.Why it says 'likely too large' at 15 g, i have no idea. i have 134 gigs available on my c drive
RAM is the biggest candidate for that message because for a model to work, it full size gets dumped in the RAM, if there is not enough available memory to withstand the model, it will complain, so try closing some apps, check your task manager and you'll fund the reason, probably. Again, quantized models exist precisely because of this.
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