I made a contribution via a Visa deposit, but still cannot download the new version.
Does your download page look like this: download.odg ? If so, the link is indicated which should prompt the download to start if it hasn’t automatically. If the link does not work for you, the first thing I would suggest is to try another browser. Also, check to see if any browser extensions or anti-malware software might be blocking the download. If this (or something similar) is not your download page (http://donate.libreoffice.org/home/dl/win-x86/4.4.3/en-US/LibreOffice_4.4.3_Win_x86.msi (showing a windows download as an example), you’ll need to explain from where/how you are attempting to download it.