It is often difficult to find a linux driver for many adapters especially dual band ones. I have an off brand "Anewkodi" which is a dual band based on the Realtek 8811au chip. Other manufacturers also make them. Realtek has a driver which you can find on github which is out of date and won't work on the newer kernels. The 8812au-8825 drivers maintained by a group on git hub. https://github.com/abperiasamy/rtl8812AU_8821AU_linux. I followed the procedure outlined in the following url for Fedora, which worked perfectly. You can change the names to any thing you want. The dkms.conf file is allready there and you need to replace the #driver version# you have selected. (actually you can put anything you want here, but you must name the src directory the name of the "driver_name-version_number" and put it in the /usr/src directory). It must be consistent in the dkms.conf file and the commands.
BTW this version of dkms is way out of date compared to other distros. With them the add command and install command setup the directories build etc based on the dkms.conf file and build it.
Hope this helps someone!