If you use macOS or Linux, you are out of luck. Thundersoft does not run via Wine/Crossover reliably. Epubor and Calibre (native macOS) are superior here.
While it can decrypt OverDrive/Libby EPUBs downloaded via ADE, the decrypted file retains no expiration date. Thundersoft warns about this in its EULA, but it doesn't block the action. thundersoft drm protection decrypter better