Inspired by 4-track cassette recorders, SketchCassette is designed to introduce a wide array of lo-fi tape effects into your mixes. From subtle warble to unearthed-from-the-attic destruction, SketchCassette is your one-stop-shop for anything and everything cheap tape.
https://www.kvraudio.com/forum/viewtopic.php?f=6&t=525051&start=121 So if your VST host doesn't support VST3 (Maschine and Reason for example), then you can't use SketchCassette.
...bug, and we've made a note of it for fixing in a future update. In the meantime, you can save SketchCassette with whatever settings you want saved as a Reaper FX chain and the parameters will be recalled properly. Sorry for the inconvenience!