Not AV. 80240020 error is installation files corrupted or missing. And it couldn't be MS servers overloaded coz by time time I got that error I have all the files inside my C drive already

This post has been edited by spikey2506: Jul 31 2015, 11:19 AM

i have the same issue, and finally success yesterday. here what i did for my Win8.1.

1. download the ISO to the PC using the mediacreation tools.
2. Make sure check your windows version is the same as what ISO you're downloading.
3. install and use ISO opener and extract to a folder at your pc.
4. run setup from the folder.
5. if you encounter it ask for Product Key, meaning you downloaded a wrong version.
6. during install it will check for uncompatible software and it will ask you to remove it. for my case i have to uninstall symantec antivirus.

This post has been edited by stevensys: Jul 31 2015, 11:19 AM

See...virus scanner is the culprit! But if no internet security, how? Don't feel safe.

it's has nothing to do with your anti virus...just stop using windows update method..use the windows download tool method..

i have the same thought like you previously...using windows update for 4-5 times and wasted my 2hours for repeat download and try...afterward...use windows download tool method...upgraded just 1 try.

doing the same to my dell latitude 10 also 1 try success...

Actually for those thinking of fresh install and instead of upgrade in order to get a fresh clean OS hard disk, i think the following will suffice:

1. Install by upgrade method.
2. Choose "Do not keep anything".
3. After successful upgrade, just use the disk cleanup wizard to remove the old windows system file and the temporary installation files.

I did that for my win8.1 pro desktop and the system hard disk seems pretty clean after the whole process. Dun think i will redo a fresh installation.

ah that's the possible reason that guy had the product key dialog instead of going directly to upgrade process (because of iso with wrong windows version).


This post has been edited by horns: Jul 31 2015, 11:28 AM

that method uses the tool i did that didn't work for my case.

my solution for others if ran into update bugs, the easiest method that 100% worked was to just reset factory which basically just reinstalls your current windows os, then the windows update to 10 will work.

this is for win 7/8/8.1 upgrading to windows 10 from a laptop by the way.

Did anyone manage to upgrade to Windows 10 ? ..

no one~

Really unfortunate a few of forumers experince the same.

Will try again tonight.

Will change language (location plus administrator), turn off anti virus if any (not sure I have it), turn off fire wall.

Will be using Media Creation Tool Upgrade this PC. For info mine is Win 7 Home 64 bit.

Thanks for sharing and good luck in upgrading.

Good luck bro. I'd say the upgrade is worth the hassle. I am loving Win 10 so far

Will try my best to upgrade as well ..

mine upgraded successfully at 12am this morning~!!

tooks 30 minutes to finish the process, i found that it will download another tools from Windows Update before the upgrade start...

Maybe that the missing file that you all looking for?

Cheers!


Attached thumbnail(s)

Yea .. agreed.
After updated with that file .. its working now for me ..

yup, why i know this. first i downloaded Windows 10 Home ISO and try it as i thought my version is Windows 8.1 home. it shows please enter your product key. then google told me i use the wrong version. I check again my win8.1 version and it's actually is 'Windows 8.1 Home Single Language' version. then i redownload the correct ISO and everything when smooth later.

Am thinking should i uninstall my Mcfee.. maybe windows defender is good enough..

Took me 3 hours to finish the installation process yesterday morning. Lol.

Windows defender is good enough for average users. Turn on the real-time protection (should be already toggled on automatically) and you're good to go!

This post has been edited by lolzcalvin: Jul 31 2015, 12:31 PM

I hope porn is included as part of average users? =p

Is the startup in win10 as fast as win8.1? My asus laptop with win8.1 can boot up within 10secs with HDD btw

Yes....Fast Boot with UEFI....