Hello TJhere, thanks to contact the Microsoft Community. My name is Wendy Jones, I am an Independent Advisor.
To block downloads you can create a GPO in the organization, you can check the steps for that process on the links below:
https://thesolving.com/server-room/how-to-softw...
https://www.thewindowsclub.com/how-to-prevent-u...
If you can not create GPO you can disable downloads options from the different browsers and Microsoft store:
For Internet Explorer:
Open Internet Explorer.
From the Tools menu, select Internet Options.
In the Internet Options dialog box, click the Security tab.
Click Custom Level.
In the Security Settings dialog box, scroll to the Downloads section.
Under File download, select Disable, and then click OK.
For Chrome:
https://support.google.com/chrome/a/answer/7579...
To disable Microsoft store downloads:
https://www.techrepublic.com/article/how-to-man...
https://www.urtech.ca/2015/09/solved-how-to-dis...
Check all this information and let me know if that work for you.
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Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.