Don’t use “download accelerators”, they increase the chance of corrupted files.
For customers using Microsoft® Windows® we recommend use of the Mozilla Firefox Browser, version 3 or later as from our experience it offers the most reliable operation.
On Mac just use Safari
When you get an error, try to re-download the file. This will usually clear up any trouble.
Never use a wireless connection to download. Also wireless local networks can cause many (unnoticed) trouble because the connection can be dropped often and you don’t notice it. Use a wire connection to download.
Maybe that your ISP (internet service provider) caches data and the cached copy of the installer is corrupted. In this case it's best to download a few days later.
If your internet connection is slow or unreliable, maybe you can use a friends internet access to download the file.
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