Issues Downloading Packs

[fireblaze1125]

Whenever i try to download a new modpack it'll start downloading, but then randomly launch it before it's even done downloading and it does this no matter how many times I try. It normally prematurely launches during or right after the phase of installing minecraft assets. This has never been an issue before the new launcher and i really wish the old one was back as it was much easier to use and navigate and most of all it wasn't extremely buggy. I'd appreciate some help on this issue though.