If you absolutely cannot pay and the demo expired, do not give up. There are incredible free VST compressors that emulate the LA-2A vibe.
If you want the real Waves CLA-2A right now for free, follow this exact path: Waves Cla-2a Compressor- Free Download
Don't want to download anything? Use your DAW’s stock compressor with these settings to mimic the CLA-2a: If you absolutely cannot pay and the demo