UhuruNUru: Nothing to do with galaxy trash, I have 18 MB/s connection, and my classic installers downloads are full speed.
Just redone a file to check for you, still OK here.
There have been others posting about slow speed, unless you are all in the same region, and it's a local server issue, I suspect the problems at your end, or your provider.
Check your Network
Try downloading a large file from another site to check speed.
Try another browser, or if you have extentions with them disabled, firefox has a built in easy option to that.
I use the menu bar, which you can turn on in customisation, it's in the Help Tab, don't know how you get at it with useless default setup.
Easy excuse, no, this is a common issue with GOG galaxy.