Edit May 2- I solved this by downloading at a location with stable fast internet so have overcome the download issue/ This is all was happening because the Bandlab assistant cannot resume a download if it is interrupted. See this thread for info on how I solved the problem..    http://forum.cakewalk.com/How-to-save-the-Cakewalkexe-file-m3754437.aspx
 
 
I'm still trying but something is broken. I'm on a few other threads with this but I thought I'd start a new one and see how many got the update WITHOUT any hassles? 
 
I'll show you what happens to me,, this will be the 4th cycle. 
 
The first couple of trys I just let the assistant sit there for hours showing no sign of life. Followed all the recommended advice. Just keeps going back to this. Big green button. Clicking the button gets a "downloading" flashing from anywhere from 10 minutes to all day. Then it will say installing sometimes but then nothing happens after that. 
 
SO I thought I'd try installing directly as someone else said had worked. 
Here is the Bandlab download folder, sort of hidden just like CCC was but somebody managed to dig it out. You can see there is the 2 files for the update. 

When I click to run the cakewalk.exe as Admin I get this

So I delete the file and try again. 
 Just goes round and round. 
 
 
 

OK looks like something might happen this time. Now the 2 files are slowly growing as I kept that folder open after I just clicked the green button for the 5th time. Cakewalk is now over 135,000 kb and growing. Anybody have a successful install know how big it should be? And why is there the instrument.exe? 

Images don't show... Can you post the screenshot on other host?

My experience was as follows:

Opened BA 3.06.  Clicked "Check for updates" - told me update was available, so I clicked update.

This sat there for ages doing nothing.......  so I exited BA 3.06 (By the BA menu | quit option, not using X on top right).

Then I went to cakewalk.com to re-download BA expecting this to give me the latest version.  It did.

Upon installation, I then ended up with BA 3.08.

From here, I ran BA 3.08 and went to the "Apps" tab to check for a CbB update.  It stated there was one, so I clicked "update"

After about 20 minutes the new version of CbB had installed - it showed me the progress until completion.

CbB is now version 2018.4 24.04.1 Build 28.

I also used BA 3.08 to successfully install the latest Theme editor - I did not worry about the other addons as I already had them.

It worked for me on a laptop with win10 without problems.

Are others seeing my Screenshots? I use Imgur and it has always worked. 
 
Thanks for feedback. This whole thing might just be that if the download is interrupted then it will not work.
The assistant is not using your browsers download so there's no management happening. 
The first version we got went to the Chrome Download folder. This one is hidden. 
 
Well at this point the Assistant has once again just stopped doing anything and my 2 files show as this.
Nothing has changed for 20 minutes. 

Cactus Music
Are others seeing my Screenshots?

 
Yes they are showing up just fine here.

When I downloaded it on my main computer for the first time, it showed up as being in demo mode. I quit and re-opened and it's been working as expected. However, I was confused that nothing told me the download was finished. I checked the download properties and when the size stopped increasing, I figured it was done...it was.
 
What's unusual about this isn't that it ended up working. What's unusual is that this happened with AT&T DSL (their slogan: "Seriously, just have someone Fed Ex a USB stick to you"). 

Cactus Music
Thanks for feedback. This whole thing might just be that if the download is interrupted then it will not work.
The assistant is not using your browsers download so there's no management happening. 

 
Where are you based? Its possible that the CDN in your region is somehow capping you for some reason.
The latest CbB release is about 545 MB in size and the instruments installer is about 898 MB.
You shouldn't try and run the installer manually before assistant has finished.

I updated Bandlab Assistant, then selected Update CbB and CbB just downloaded and installed with no intervention.
 
Bandlab changed its status from downloading to installing but just sat there. CbB had been downloaded and installed without any intervention from me but BA just sat there unresponsive with no further status updates.
 
I was able to download and install 2 options I chose again with no intervention between selecting them and their download and installation.
 
It seems that a new installer file overwrites the previous ones as there seem to be only 2 files; Cakewalk.exe and Instruments.exe