ThorOfAsgard
You want to go to the folder called Oculus inside windows folder, probably in drive c, program files folder, when you opened oculus, you search for OVRPlugin.dll
If you were a previous SLR app user, you are one of the lucky one with a ver, 1.78 OVRPlugin.dll
You need ver. 1.78 or earlier to fix it.
Otherwise, you just google SLR app on the internet, install it, and grab the OVRPlugin.dll from there, the installed folder is /software/software/software inside the oculus folder and the installed folder is for a program called old-deovr player (for you it will be very easy, as you just installed the SLR app, so the latest OVRPlugin.dll will be ver. 1.78. In the software folder you will see two deovr program, one is the SLR app, and one is the deovr program. If you right click mouse, properties, you see the ver. You want the one at ver. 1.78