Download of Make fails or dmg file is not recognized

I am using a Mac Book Pro OS 10.10.2 Yosimite. When I try to download Sketchup Make the download gets to the last few Meg remaining and stops. I was successful in obtaining a dmg file only to be told by the image loader that the file was not recognized. I have tried using both Firefox and Safari browsers to download the file. Can you tell me what I am doing wrong?

Provided you have enough space for the download on your destination disk, it sounds more like an issue with your internet connection than something you are doing wrong.

I have lots of free space for the download. I found a way to test if it was an ISP problem. I created a VPN to another network and tried the download. It took 3 times longer but it was successful. I will now be talking to my ISP.

Thanks for your help.