Repeatedly have tried to download a 4.2.6 upgrade to Mac with no success. You simply cannot get out of the Donations page! Have you all gone out of business? If so, shouldn’t you publish the fact on the internet?
There is something very wrong with your browser. From http://donate.libreoffice.org/home/dl/mac-x86_64/4.2.6/en-US/LibreOffice_4.2.6-secfix_MacOS_x86-64.dmg, I was able to download the .DMG file with both Firefox and Google Chrome. If the download doesn’t start automatically you can click on the link called “Your download LibreOffice_4.2.6-secfix_MacOS_x86-64.dmg should begin shortly” If both of these options don’t work, I suggest you try a different browser or computer.
Now about your “gone out of business?” No, there is enough money to keep the lights on and the the servers running. Also, LibreOffice is non-profit organization, not a business. While we could always use more donations, the issues you’re experiencing are totally non-related.