Recently, I've had a lot of troubles with both opening the installers I download, and even been unable to delete them from my downloads folder.
I dunno if this is a windows issue, or something with the modpack. Even right-clicking on the file takes a few minutes before the right-click menu pops up.
If someone here knows what might be happening, or if there are any others here having the same issues, please speak up.
Running Win10