Some of the Embarcadero servers (in one of the web farms) are experiencing some severe and prolonged outage. This is affecting (among other things) Delphi 10.3.2 installation. As a temporary workaround, the company has:

We should soon have the regular GetIt-based offline installer for 10.3.2 working again with the temporary server. 

August 1st Update

We now have the ability to install 10.3.2 via GetIt using this temporary system, there is no need to change the GetIt URL manually, as it is embedded in an updated installer. And CodeCentral MyRegistered products is online again with the updated downloads.  Read more on the latest status at https://community.idera.com/developer-tools/b/blog/posts/new-10-3-2-getit-installer.

Thanks for your patience and sorry again for the inconvenience.