Author Topic: [Bug] Avast is changing/corrupting downloads  (Read 8446 times)

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Offline Lisandro

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[Bug] Avast is changing/corrupting downloads
« on: October 16, 2016, 07:53:50 PM »
Well, it's hard to say, but I lost quite some hours to figure out that the culprit is Avast.
1. I've tested Firefox, Chrome, Opera and Edge.
2. I've tried with and without any download manager.
3. I've tried disabling Windows SmartScreen filter.
4. I've tested three different networks (one ethernet and two WiFi).

Only disabling Avast will allow me to download executables, .msi and archive files that match the hash in the download site.
I'm on Windows Insider Preview 14942 (x64).

« Last Edit: October 17, 2016, 02:18:58 PM by Lisandro »
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Offline bob3160

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Re: Avast is changing/corrupting downloads
« Reply #1 on: October 16, 2016, 08:40:17 PM »
No problems on build 14936. There are many reported problems on the version you are using when using an AV other than Defender.

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Offline rush_deleted

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Re: Avast is changing/corrupting downloads
« Reply #2 on: October 16, 2016, 08:40:59 PM »
i wrote about it here as well, with firefox...

Offline Lisandro

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Re: Avast is changing/corrupting downloads
« Reply #3 on: October 17, 2016, 02:18:39 PM »
Bug is still around. Tested today with Notepad++. Download with Avast on gives and error (file corruption).
Disabling Avast and everything goes fine.
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Offline libor_b

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #4 on: October 17, 2016, 04:37:35 PM »
Hello,

This issue is known and we are working on a fix. Currently the way to download files uncorrupted is to turn off Web Shield. I'm sorry for Your troubles.

Libor

Offline Rednose

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #5 on: October 17, 2016, 04:48:53 PM »
Windows 10 Insider Preview builds are only for testing purposes.
So yes, you can/should expect bugs, unstable systems or worse ;)

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Offline heikwith

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #6 on: October 17, 2016, 05:06:27 PM »
Well, it's hard to say, but I lost quite some hours to figure out that the culprit is Avast.
1. I've tested Firefox, Chrome, Opera and Edge.
2. I've tried with and without any download manager.
3. I've tried disabling Windows SmartScreen filter.
4. I've tested three different networks (one ethernet and two WiFi).

Only disabling Avast will allow me to download executables, .msi and archive files that match the hash in the download site.
I'm on Windows Insider Preview 14942 (x64).

Same problems here with 14942.
After install of 14946 most of my problems are gone.
Only problem left (until now) are download problems with Windows update with updates for Windows Defender.
Problem gone after disabling Avast.

Offline Lisandro

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #7 on: October 17, 2016, 11:57:52 PM »
Hello,

This issue is known and we are working on a fix. Currently the way to download files uncorrupted is to turn off Web Shield. I'm sorry for Your troubles.

Libor
Thanks for acknowledging it. At least, I don't have to invest more time on discover what is wrong :)
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Offline heikwith

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #8 on: October 21, 2016, 11:19:26 PM »
After install of 14951 still download problems.
Problems gone after disabling Avast

Offline Lisandro

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #9 on: October 22, 2016, 03:34:23 AM »
I have reverted to 14931 (slow cycle of updates) and everything is fine.
Most probably the multiply instances of svhost processes are behind the issue (but this is just a guess).
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Offline heikwith

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #10 on: October 24, 2016, 01:23:58 PM »
Ticket created for this issue:
#563093 Download problems with W10 Insider Preview Build 14951 for PC
https://support.avast.com/support/tickets/563093

Answer from ticket:

I discussed this problem with our developers and they informed me they are currently working on a fix. The fix version of Avast should be released soon.
« Last Edit: October 24, 2016, 03:08:41 PM by heikwith »

Offline heikwith

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #11 on: October 26, 2016, 09:56:50 AM »

Known issues for PC in build 14955
If you have a 3rd party antivirus product installed on your PC – your PC might not be able to complete the update to this build and roll-back to the previous build.
Read more at https://blogs.windows.com/windowsexperience/2016/10/25/announcing-windows-10-insider-preview-build-14955-for-mobile-and-pc/#IVVmeYJlbdkbOO7M.99

Offline heikwith

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #12 on: October 26, 2016, 09:26:02 PM »
I have upgraded to 14955 and the download problems still persists

Offline Eddy

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #13 on: October 26, 2016, 09:30:10 PM »
Looking at all the reported problems with Windows 10, I start to wonder what the worse Windows release is/was.

10 or Vista.

Offline bob3160

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Re: [Bug] Avast is changing/corrupting downloads
« Reply #14 on: October 26, 2016, 10:47:42 PM »
Looking at all the reported problems with Windows 10, I start to wonder what the worse Windows release is/was.

10 or Vista.
You are looking at problems in Preview Builds.
There aren't any problems in the latest stable release. :)
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