In reply to choppyhook3:
hmmm... are you using the curseforge app? maybe try downloading a different mod, preferably a small, simple one to see if the issue is with downloading anything or if pixelmon (or other bigger modpacks) are the problem. I tried to download pixelmon and it also froze at 42% but eventually got past it, so it's possible that whatever is being loaded up at 42% is too difficult for your computer. so try to download a simple mod so you can figure out if it's a download thing or an issue with big modpacks being hard on your computer. (if it is the latter, I completely sympathize, mine is not the best either). also, with it stopping at 42%, does it just completely stop and do absolutely nothing after? no improvement after a couple of minutes? or does the download stop/close completely? Just making sure it isn't simply a reeaaalllyyy slow download lol! It could also just be a bug, as the app is still in beta, if you can't figure anything else out, try contacting curseforge directly!