They might fix this later but for this version it would seem the Assistant deletes the cakewalk.exe file after it installs it.
A few of us found this little detail very annoying.  
If you have limited internet bandwith or like in my case, internet that can drop out randomly it is nice to have the option of transferring downloaded installers from one computer to another. 
 
Here's how you can save the Cakewalk.exe file before it's deleted.
 
Install and Log on to the Assistant. it should be version 3.0.8 
 
Go to here

 It will be empty at first.
Now click the "install" button on the Assistant.
It will show Downloading. For me it took 7 minutes and it then changed to "installing" and a dialog box opens to continue.
DO NOT click on it. Yet, 
AT THIS POINT copy and paste the "cakewalk.exe" file to a new location , USB stick etc. 
Now you can take that file to your other computer to install. 
 
Note that if you had chosen other options to download, like Drum Replacer, this will also show up in this same folder and you can copy those as well. 
 
Note May 9th: I posted this below. I transferred the files to a fresh computer and had no problem installing Cakelab. It will go into DEMO mode. You will need to then install the Assistant and log on to authorize Cakelab. But this will use very little bandwith if you saved and copied the assitant.exe file too.. 
 

Nice tip, Johnny.
All the best.

where does it download the exe? I have checked download folder in windows (my nromal) and also in the bandlab asst directory. Nothing?
As I said already, I have NO download folder in BL asst dir? I mean if you created it then I should still see the exe somewhere in the directory?

stratman70
As I said already, I have NO download folder in BL asst dir?

To access the AppData folder (and beyond) we need to tick or check Show hidden items (within file manager):
 

(Image link)
 
(Copied and pasted from this thread.)
 

I was just doing right click on Bandlab asst shortcut, properties and open file location. I know about hidden folders but I thought I was in the right folder.
 
Thanks very much

Great! Got it. As john mentioned above, it was really bothering many of us. I also was pleasantly surprised to se custom install option. well for some of it anyway.

Rough start to these initial renditions of BandLab Assistant’ if you ask me. Almost like no one at BandLab had ever heard of any type of download assistant program before, despite the fact that they are all over the place. I appreciate Catus’ work in tracking down the disposition of the exe file. This will definitely help me save some gb’s in downloads over time.

And if it wasn't poor coding but the intended way of delivering a free piece of software?

M

could be an option to "remove files after install" then you could keep them, or have them deleted from a tiny ssd

So Frank, did you find the folder? I was thinking you might have opened the other folder a I pointed out above there are 2 of them.
One contains the  assistant installer :
 C:\Users\Cactus\AppData\Roaming\BandLab Assistant
 
The one you want will contain the Cakewalk and other content files;
C:\Users\Cactus\AppData\Roaming\bandlab-assistant\Downloads 
 
I forgot my portable HD at work last night so didn't have a chance to try it but I see no reason why it would not work.