I bought two of these monitors last week because they fit side by side in my computer cabinet. I am trying to setup working from home. I cannot get the DDM (Dell Display Manager) to recognize the second monitor. Contacted the maker of the DDM software, and was told I have the wrong cable. One monitor currently uses VGA to VGA. Second is HDMI to VGA. He said that’s not right. I need "HDMI-to-DisplayPort" adapter that works with DDM (i.e., supports DDC/CI). The computer is old, an Inspiron 660S, but runs fine for my needs as my company is completely cloud based. Any recommendations on where to find that cable that was recommended?

Thanks for your help.