My Avast folder size (in Program Files) is 372 MB.
I don’t have any of the extra tool installed. Only the basic 3 shields.
In previous versions, Avast folder size would grow after updating the viruses list and reduce in about 50 MB after rebooting.
With the latest version, the folder size remains the same after rebooting.
I’d appreciate your help.
My “C:\Program Files\AVAST Software” is up to 577 MB at the moment. I know it was under 500 MB as of this morning.
I’m not hurting for free space (as apparently you are). However, I’m also curious about when it will clean up after itself, as you are.
-Noel
virtualization? 
Meaning?
Avast NG (virtualisation) takes about 70Mb to hold the VM
Thank you essexboy.
I haven’t installed any tools, and a I don’t have an “NG” folder.
As the folder is so large I would recommend a clean install to remove everything and start afresh 
Download Avast Uninstall Utility to your Desktop.
Download the correct version of Avast
Avast Free
Avast Pro
Avast Internet Security
Avast Premier
Disconnect from the net
Uninstall Avast via control panel
[]Run the uninstall tool and accept the reboot to safe mode
[]Once complete reboot your system
[*]Reinstall Avast
My folder is at about 399mb and I don’t have any extras installed either. If you are so tight on space as to be worried about megabytes might I recommend running wise cleaner and ccleaner and especially focus on the windows updates in wise cleaner… that’ll clear out about 1.5 gigs
Plus gargantuan SSDs aren’t break the bank expensive any more.
Mine seems to have stabilized at 578 MB.
-Noel
Thanks again. I appreciate your help.
A regular uninstall first, and then Avast uninstall tool. Is that correct?
I don’t mind the extra 50 MB. My purpose in posting the question was to make sure there was no bug relating to cleaning up.
Does that seem OK?
@ Yaron10
This really isn’t that unusual, the installation file is highly compressed, when unpacked it is going to be of this order.
My avast free installation/program folder is currently 408MB and this fluctuates after avast VPS updates and avast housekeeping.
The largest folder is likely to be the setup folder as that has integrity checking (copies of files, etc.) and defs sub-folder, the virus definitions one sub folder of defs containing the unpacked virus definitions database is of the order of 80MB.
As you can see these two folders take up the lions share of the 372MB you mentioned and that isn’t including the other sub-folders. So I don’t think that you are likely to gain much from a clean install.
@dprout69,
I use CCleaner regularly. Thank you.
@NoelC,
Thanks for the information.
Thank you David. I appreciate it.
As I’ve mentioned: with Avast 9, the folder size was about 320 MB, and now it’s 370 MB.
Is that normal? And what might be those extra 50 MB?
Defs are about half the used space. Definitions folders come and go without reboots as far as I know.
Note also that the items in the setup subfolder are normally created compressed to minimize their footprint.
-Noel
Thanks again.
If you happen to have kept a copy of the old avast installation/setup files, even keeping just the last one, it will give you an indication that the new program update is larger.
For the most part this will be related to new functions and features. If I recall correctly the latest avast 2015 installation/setup file is around 120MB fir the free version and that is around 20-30MB larger. This would also be compressed, so would be larger still when unpacked during installation/update.
As an avast user not employee, I can’t say specifically what makes up the increase in size other than new feature are likely to mean a larger size.
40 MB larger, actually…
Directory of D:\Download\Avast Antivirus
12/20/2013 02:03 PM 91,412,976 avast_free_antivirus_setup__2014_9.0.2011.263.exe
Directory of D:\Download\Avast Antivirus
10/22/2014 12:53 AM 131,078,000 avast_free_antivirus_setup__2015_10.0.2206.692.exe
-Noel
Well my speaking from memory is never going to be entirely accurate - having recently done a clear out of old installation files.
But it goes even further to confirm the program and its new functions is larger. Good job someone is keeping records ;D
Bit more history for your collection (from XP)
04/18/2010 11:30 PM 48,417,032 setup_av_free(v5).exe
03/31/2013 08:46 PM 97,495,576 avast_free_antivirus_setup_7.0.1474.exe
06/19/2013 09:54 PM 117,478,104 avast_free_antivirus_setup-v8-1489.exe
02/24/2014 12:17 AM 88,725,592 avast_free_antivirus_setup-v9.exe
03/21/2014 04:27 PM 88,551,496 avast_free_antivirus_setup-v9-2016.exe
05/01/2014 09:33 PM 88,882,192 avast_free_antivirus_setup-v9-2018.exe
06/27/2014 02:28 PM 91,906,368 avast_free_antivirus_setup-v9-2021.exe
Version# is what I often append to filename when I download.
Thank you David, Noel and cooby. I’m grateful for your help.