Downloads are hosted off site in various different locations by developers. We cannot control speeds offered by the hosts. If it is a busy time on the site and everyone is downloading the same thing from the same source it will slow things down. Come back at a different time ‘off peak’ to try again.
Downloads can also vary based on your location & your network provider. Check your speeds.
Ensure you don't have things on your home network that are slowing down install like antivirus software.
We do not recommend using internet at your office or other place of work, coffee shops etc. There will more than likely be restrictions of their network for downloads.