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TI2015 older backups not readable any more

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I need to get access to a couple of files, which are stored in backups I made a couple of months ago. At that time I used Acronis TI2015 build 5539.

Now I have build 6613 installed.

When I try to open the old backups, I only get an error message "Error opening backup archive" (see screenshot).

This happens with 3 different backups, so it is very unlikely, that these backup files are damaged. An attempt to validate the backups also fails

Any idea what I can do to access the contents of the old backups?

I think, it´s very problematic, if access to backups is no longer possible after installing new builds of ATI2015.

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Were the backups ever copied or moved from their original location?

Normally, using an older REcovey CD but it has been reported as working in 2014. Do you have an earlier verson of 2015 or 2014 you can try?

I have renamed the folder, where these backups are located. But I had to add them manually to the ATI list of backups anyway.
Normally I can access files inside backups from Windows explorer. This works well with newer backups, but not with the old ones.

Unfortunately I don´t have previous versions or builds of ATI any more.

You can downlolad only the bootable media files for any of your registered versions from your personal Acronis account.

My signature link 9, and then picture 7 inside that link illustrates.

Thank you for your hint regarding use of bootable media.
I was astonished to see, that I could open my old backups using my bootable USB stick made from latest build 6613.
So I think, there is a bug in the installed ATI2015 build 6613.
Anyhow - this solves my problem.
Thanks again.