Hello, I'm trying to install the driver on Windows 8.1. It is a work system running custom software and cannot be upgraded or downgraded to either Windows 7 or Windows 10 but I did upgrade the GPU, from a GTX 1060 to an RTX 2080. Raytracing is not something I want or need, I just want to get the GPU driver installed. Steps taken: -Use the Windows 7 drivers; -Mod the .INF files with the exact HWID of the card; -Tried the Win 10 drivers; None of the above worked, so: -Made live Win 7 USB stick; -Made live Win10 USB stick; -Doesn't install on Windows 7 live USB with Windows 7 drivers; -Installs on Windows 10 live USB with both Windows 7 and Windows 10 drivers (lol,wut?) Errors I get on both Windows 7 and Windows 8.1 is: The NVIDIA graphics driver is not compatible with this version of Windows / The graphics driver could not find compatible graphics hardware. Device ID in Windows Device Manager is: VEN_10DE&DEV_1ED0&SUBSYS_77101558&REV_A1 which should match with the driver in nvcvi.inf of both the Win7 and Win 10 driver packages: %NVIDIA_DEV.1ED0.7710.1558% = Section172, PCI\VEN_10DE&DEV_1ED0&SUBSYS_77101558 NVIDIA_DEV.1ED0.7710.1558 = "NVIDIA GeForce RTX 2080" Driver packages I've tried, for both Windows 7 and Windows 10: 411.63 418.81 431.60 436.15 441.87 456.38 I'm probably doing something wrong, though I have no idea what. I've tried the sticky .INF modding thread but that didn't work or I botched something. Can someone please help me with this issue?