You can download GoldWave for free from the official website. It operates on a generous evaluation system based on commands used rather than a strict calendar expiration.
If you need to create music, LMMS is a free digital audio workstation (DAW) that includes recording, sequencing, and synth plugins. Not a direct GoldWave replacement but worth mentioning for musicians.
This allows you to test the audio processing effects, restoration tools, and recording capabilities before spending money. Top Free and Open-Source Alternatives to GoldWave
The internet is filled with websites claiming to provide free license keys or "keygen" software for GoldWave. However, these files are almost never what they seem.