The (pre-v10) supports only DX plugins. The new version supports 64-bit VST3 plugins. This means you can load iZotope RX for spectral repair, Ozone for mastering, or even guitar amp simulators directly inside WavePad. For serious restoration work, the new version is non-negotiable.
If you prefer a specific older version (perhaps because it uses fewer system resources or you dislike the newer interface), you can often find them through these channels: wavepad sound editor old version new
The phrase "" usually means you're looking for a comparison between older releases and the current software, or perhaps a way to roll back to a simpler version . The (pre-v10) supports only DX plugins