Thanks @psychobunny 👍 That worked with a very slight amendment to the last command:
npm unl lwip npm unl redisearch npm i redisearch@^0.0.5In case it's helpful, before doing that I was getting this error:
npm ERR! peerinvalid Peer nodebb-plugin-dbsearch@0.2.17 wants redisearch@^0.0.5