This is definitely possible. I had to press VMware support to get the right places to change it. I was able to make the change in a 2.6.1 environment.
Please snapshot the vIDM machine before modification
Below are the steps for changing this URL. Commands to be entered begin with '$'. Note that the new link must be a URL (ex. https://download.mysite.org). I was not able to get a network share set as the link (This will not work "\\MyServer\Share\client")
NOTE: I had to reboot the appliance to get the new link to take effect.
---METHOD 1---
Run the following command to return a list of files that need to be modified:
$ grep -irl 'http://www.vmware.com/go/viewclients' /opt/vmware/horizon/workspace/webapps
Each of these files contains a line that resembles this:
"_ViewDownloadUrl_":"http://www.vmware.com/go/viewclients",
Change the URL to the destination of your choice.
---METHOD 2---
This is a way to automate METHOD 1, since doing it by hand would take quite a bit of time
$ OLD_LINK="http://www.vmware.com/go/viewclients" # Leave this variable as is
$ NEW_LINK="https://download.mysite.org" # Set this variable to the download link of your choice
$ grep -irl "$OLD_LINK" /opt/vmware/horizon/workspace/webapps/ | xargs sed -i.bak "s|$OLD_LINK|$NEW_LINK|g" {} 2>/dev/null
The final command searches for all files in '/opt/vmware/horizon/workspace/webapps/' that contain 'http://www.vmware.com/go/viewclients', it then passes that list to 'sed' which replaces the old URL with the newly defined URL in all of those files. The sed option '-i.bak' creates a backup of any files that will be changed.