10.15.5 Supplemental Update is frozen

Mine was stuck too, I did however restarting my laptop by holding down the power button. When I turned it back on it installed Catalina. No problem.

Give it another hour, and if it is still frozen then just switch it off and restart.

if you are downloading updates from Apple it is always best to use a cabled

connection to your router. If you can't place your mac as close to your

router as possible, and don't use any other devices that share the same internet

connection while it is downloading.

Guys, succesfully installed the OS 10.15.5, it took at least 30-45 mins on my Macbook Retina.

Screen flickered few times while installing and that should be normal.

Didn't encountered problem while installing and after that too.

To date, I have only installed on Late 2012 iMac. Not yet on 2018 Retina MacBook Air .

iMac took about 45 minutes from start to finish with about 7 reboots during the installation. There were a few time I thought the install froze but gave it all the time it wanted and eventually installed successfully.

Good Luck

What I learnt is that the download might take hours to complete. How is the progress now? Still the same? I am about to run this update over here in Malaysia time 7pm GMT +8.

I have the same issue with my MacBook Pro 13" mid 2014. No issue with my 2019 iMac.

I have the same problem with my late 2013 iMac. Have restarted a couple of times now

So restarting doesn't work? 😖

Thanks Philips, I guess I have the confidence now to install in my MacBook.

will report here the status 😉