Software update macOS Big Sur.... (version 11) how to fix it.

i have only single wifi option there is no ethernet port in MacBook Air (13-inch, Early 2014) and this is working on version 10.15.7 (19H1030) sometimes resolve the error. your sometimes take how many days because i have already spent 2 days on it. and as per internet speet its take almost 6-8 hours Sir this is my humble request please fix it asap.