On that page click on "Manage Plans" and in the next landing page that will open scroll down to "Included applications and services" section. You will see a download button to the right of the Acrobat product that you're subscribed to.
Second rule of thumb, if this download link also shows a heavy lag, disconnect your PC from the router and plug it directly to the modem and check your download and upload speeds. If you noticed that the download goes through fast , then you can safely assume that the firewall or some settings in your router are interfering with the download service (i.e. lack of firmware updates, or if you're behind a VPN change that connection to different server in closer to where you live geographically (not in another country).
Last you can always perform a ping to a random address to see if there's any latency going on, like shown in this great demonstration: