The download for the app is somewhere near 3.5 million or around that mark, I'm tipping that the Govt will get nowhere near the 40% that the app requires to do it's job properly, there are a lot of sceptical people out there.Rather, there are a lot of misguided people out there. You know the ones, getting sucked in by false memes claiming that the app knows how far you are from home etc., or always coming up with some hysterical conspiracy theory, or any other reason to refuse to do the right thing.
I had absolutely no hang-ups about downloading the app.
The gov't want an uptake of 40%; I am yet to determine whether they mean 40% of the population, or 40% of the adult population, or 40% of the working population, or 40% of smartphone owners. In any case the more that people realise that lifting certain restrictions depend on the uptake among other things, I expect to see a surge and the % next Friday will probably be close enough regardless what the figure actually is.