When you are running the install package, you can close the driver installer when it opens, and install the driver INF manually instead.
Open Device Manager, drop down Display Adapters, right-click your GPU, select Update Device Driver, select Browser my computer for driver software, enter your C:\AMD\(driver package version)\Packages\Driver\Display path in the box, check off Include Subfolders, then click Next. Once done, check device manager and verify that your GPU is detected as an AMD GPU and not a VGA/Microsoft Basic Display Adapter.