Update fails, access denied, re-install fails, access denied
Tried to execute prog, went to update, fails on access denied. Tried all the trick mentioned, even file_tracker failed. Uninstalled product, tried install of latest downloaded build, failed, access denied. Tried stopping Norton as suggested, still no install.

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Same issue here, got the error message of access denied which the KB says to download file_tracker_setup_2501.msi. It fails as well saying it was interrupted. Used Task Manager to end all Acronis processes, still fails. I also cannot log into the console now - tells me I no access to the server, please try later. I can using the same credentials log into my Acronis Account.
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Try clearing your browser cookies/cache/history, closing down the browser completely and reopening the browser again. If that doesn't help with account login, you will need to contact Acronis support for any logon/account issues.
As for not being able to upgrade... serveral other users have had an issue with the in-app upgrade due to antivirus or lack of access rights.
If possible (once you can log into your account), download the full v6571 installer. Reboot the machine to restart services and make sure a pending Windows update is not causing any issues. Temporarily disable AV. Then run the full installer by right clicking and "run as administrator" (even if logged in as an admin).
Hopefully that will get you back on track with not too much issue.
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I can log into my account via a browser and download the full v6571 installer. Login fails from within the desktop app. I downloaded, rebooted, shut off AV, ran as administrator, failed with same error message. From the desktop app on Win 10, if I try to look at Dashboard, Sync, tools, I'm asked for logon credentials and from here it fails with 'Failed to connect to the Acronis server. Check your Internet connection or try again later.' It does not appear that the desktop app uses a browser, but I cleared both Edge, IE, and Chrome browser caches to make sure. Same results. No Windows updates outstanding. It doesn't help that several days ago the local USB drive I was backing up to in addition to the cloud drive failed and the drive has been wiped out and I cannot even reformat it. Sort of hanging here with no backup at this time. I have no idea at this point what caused the drive failure but suspect it isn't related to this.
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I'm now up and running doing the below:
Downloaded full installer (AcronisTrueImage2016_6571.exe),
Uninstalled using uninstall.exe in the Program Files (x86)\Acronis\TrueImageHome directory,
Unplugged from Internet,
Rebooted,
Made sure wireless was off (unplugged and turned wireless off so I could disable AV safely),
Did NOT disable Norton Internet Security (Forgot, but different AVs or configs might need this),
Ran installer as Administrator and it installed,
Plugged back into Internet,
Now able to log on via the PC desktop app.
I think the most important was the uninstall and reboot before reinstalling.
Thanks for the help!
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It seems that version 6571 does not play nice as an upgrade on some systems as there have been numerous reports of failed install attempts which were resolved as yours was by an uninstall of the previous version followed by an install of 6571. As for myself I was lucky I guess as I was able to upgrade 2 systems without a hitch! Go figure!
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Ditto for me. No upgrade issues so far. There was another post yesterday of Cloud backup not working last night. Perhaps the connection to the Cloud also impacts upgradability through the app, or AV is blocking the connection, not sure. I have been downloadingn the full installer from my account each time and then "righ-clicking and run as adminisrator" as is my practice for all installations these days and it has served me well.
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I'm good now, installed successfully. Uninstalled previous version, shutdown, restarted, dropped internet connection (might not have been required), ran as administrator. Would be valuable if Acronis followed this forum and issued advisory when attempting this 'update'.
Thanks for all the comments and forum fix.
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Glad to hear that Richard. Thanks for posting back your success.
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I had the same issues. Tried to install upgrade from my account on website; it failed. Tried loading 2013 version from CD; it failed. As recommended, I had uninstalled using Control Panel in Windows 10. The program listing showed there was nothing for "Acronis". BUT, when I looked at the Programs folder (using the old Windows (File) Explorer there was an Acronis folder still there with several files still in it. I deleted the whole folder, rebooted, right clicked on the .exe file, ran as administrator and VOILA...it worked.
My guess is Windows 10 didn't correctly uninstall.
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