I was having this problem repeatedly. I finally got it to work by doing the following in Curseforge Settings > set backup space and simultaneous downloads to max Settings > Minecraft set default memory allocation 9gb < - I don't think this setting had an effect. I'm just including it for completion as I did change that too.
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In reply to zecaveboi:
I was having this problem repeatedly. I finally got it to work by doing the following in Curseforge
Settings > set backup space and simultaneous downloads to max
Settings > Minecraft set default memory allocation 9gb < - I don't think this setting had an effect. I'm just including it for completion as I did change that too.