Hello! Try to launch it with administration rights as ymt3D wrote in comments. Perhaps, this is due to the fact that we are trying to save the settings in the same folder with Photoshop. We will fix it in nearest update as soon as possible.
Viewing post in Photoshop Shader Plugin comments
It's too small text files, which saves only when you saving any shader or applying shader to image (last used shader). It's can't make any bad impact to your SSD. Usually SSD vendors make warranty for a 3-5 years for writing 20 GB/day. I can't imagine situation, when you will write 20 MB of shaders / day.