Trying to download X3. Firstly tried using Chrome, then Part 2 just stopped, then used IE and the same, Getting a message in the IE download list saying that "the publisher of this program couldn't be verified". I have antivirus turned off, I have refreshed for different link, but it only happens with Part 2. 

Are you sure you didn't choose "run" instead of just downloading and saving all the four parts first? And then run (execute) part one? (as administrator)
 
 

I believe I heard part 2 contains some of the VSTs and/or FX. So what I've heard is you need to make sure your virus protection is off before downloading the X3 installers. I had the same issue as you described. I reverified that my virus protection was off and then it downloaded smoothly.

Thanks for the responses. First off, Boblettross, I didn't run first, trying to download all before trying to install. Iawajava, I have Virus Protection off. I tried using my laptop to download part 2, and all looked like it was heading in the right direction until five minutes ago!! I'm going to re-verify security protections on the laptop and see how it goes. Fingers crossed!! My wait has been prolonged!!
Thanks again

Also turn off the windows defender.

Hi cowboydan. It's off!! To top it off, slow dowload speeds!!

Just an Update, it stopped the download again, "this program cannot be downloaded......". On the laptop I have Panda Gp as my security software and all are turned off. Yet, when i go into control panel-security centre it shows that firewall etc (panda)are all on, and I can't turn them off. But the download goes to 15% or so.

seveagh - I was able to solve it with the method I mentioned.

However, when I was stuck I actually opened a case with Cakewalk help. After I was already installed, but nicely of them, they sent me an alternate link for the download. Never tried that link.

Update: At 02:45(Irish Time) 02_SONAR_X3_PRODUCER.PART2 finally touched down on this system!! So, what did I do different? Well, with Panda GP 13 disabled I rebooted my Win7 pc. After restart Panda was still disabled so I proceeded to download part 2 and..... it downloaded beautifully. Have to say it was the most beautiful download to watch!! So with all parts downloaded I now have my X3 installed.
 
Thanks again for the replies.