There is a VERY loud tone at 90Hz . That can be quickly removed with a notch filter …
The latest version of Audacity has a notch-filter in the effects list . If your version of Audacity doesn’t you can get one here.
De-clicking is a far more time-consuming and computationally-intensive task than removing constant hum with a simple notch-filter.
I used the [beta?] Paul-L de-click plugin in Audacity , which you can get here … Updated De-Clicker and new De-esser for speech
However that plugin can easily take 5x the playback-time to declick audio. I’ve only used the Paul-L de-click plugin on very a few minutes of audio in one go , others have complained a crash occurred when they tried to process hours of audio in one go.