Ha!  "Hash does not match" for part 1 !!!!  That's a cool utility. 
Could my lousy broadband service be causing this downloading problem?  It's Verizon from a "cantenna."  Had problems with intermittent service in the past. 
Wish I could get X3 on CD or DVD and use the download payment as credit.  Doesn't look possible now.
 

Freaking Heck.  The five X3 files don't match!!!!  Only the Dimension Pro setup file matches.  Downloads blowe.

If you are using the same browser, it might be time to change or use FreeDownloadManager. Pretty sure that was what Cakewalk recommended in the link I provided above.

Well, the whole problem turned out to be corrupted installation files!  Free Download Manager worked very well, only giving me a corrupted file once, as opposed to nine times in eleven tries for Internet Explorer!  The MD 5 Check Utility worked great, and the hash-matched files installed perfectly.  Thanks, you guys!!!!!  I really learned something.  Sonar community rocks.

Saxon1066
Well, the whole problem turned out to be corrupted installation files!  Free Download Manager worked very well, only giving me a corrupted file once, as opposed to nine times in eleven tries for Internet Explorer!  The MD 5 Check Utility worked great, and the hash-matched files installed perfectly.  Thanks, you guys!!!!!  I really learned something.  Sonar community rocks.

Same thing happened and same solution worked for me as well when I downloaded X2.  Good job!

Original post was intended for another thread...couldn't find a way to delete this post. Sorry guys.

YAY!
 
Sorry for your data overuse charges - but at least it's up and running now.
 
On to the next trauma!  :)
 
Bob Bone
 

I purchased the X3 Producer upgrade, and have been trying to download the files for the past week. After many repeated attempts, I have managed to download only 7 of the 13 files successfully (i.e., the downloads match the reference MD5 checksums). I have tried all of the advice in this thread:  virus check disabled; download only using a hardwired connection; tried downloads using Chrome, IE, Firefox and Free Download Manager. I sent an inquiry to Cakewalk, but got no response. I will try to contact them by phone later today when the support line opens. Meanwhile, I'm at the end of my rope. Any other ideas to try?

Try downloading from a different computer with a faster connection, and then just burn the downloaded files to a DVD and port them to your computer for installation.
 
Bob Bone
 

A different service provider