Can't update Spybot S&D

[alfred_bowman]

I've been having this problem off and on on three different PC's
running Windows ME, 2000 and XP Home for some time now. They are connected to the Internet by dial-up (1) and Verizon DSL (2).

I start the program and check Search for Updates. When updates
are found I select Detection Rules and anything else that seems
useful. Too many times the download for Detection Rules and
others produces a !!!Bad checksum!"

I have had to repeat the download operation 2-3-4 times before it works. Sometimes I have to give up and try again another day.

Does anybody know why this happens? Is there anything I
could/should do?

[md usa spybot fan]

"Bad Checksum" problems are usually caused by overloaded download servers.

To change download servers and for a workaround for "Bad Checksum" errors please see:
http://forums.spybot.info/showpost.php?p=345&postcount=2

Note: The download server can be changed after the "Search for Updates" and before clicking "Download Updates". So if you find a server that works well, you can start by using that server in the future. Also note that if you want (not necessarily recommended) you can select a server and then right click on the button and "Set this server as the preferred download location". If you do that Spybot will select that sever rather than a random server for future updates.

Additional information:
When updating, why do I get an error message that the "update is forbidden" / "bad checksum!!!"?
http://www.safer-networking.org/en/faq/20.html
How to update the program to the newest version
http://www.safer-networking.org/en/howto/update.html