The LG G6 H872 firmware isn’t hosted on our server anymore because we had to limit our expenses during this recession.
There are a few ways you can potentially install the LG G6 H872 stock ROM still though. First, try one of our competitor sites which often have similar files only hosted on their own servers. Second, check for a free firmware update tool made for LG that can download the firmware directly from LG’s servers. Lastly, you can contact LG and ask them if they are willing to share the firmware file with you.