Could not mount a backup
Hello!
I've got some backup .TIB files made by Acronis TI 2011. These files are a chain of incremental backups of my system SSD: backup_(159).tib, backup_(159)2.tib, backup_(159)3.tib and backup_(159)4.tib.
After I updated to Win10, I also upgraded Acronis TI to version 2015.
If I try to mount these files as a disk in Windows 10, I can do it for backup_(159) and backup_(159)2, but for backup_(159)3 and backup_(159)4 I get an error (after choosing drive letter), something like "Could not assign partition letter" (I've got a localized version, this is my translation).
If I choose "restore files" in Acronis TI interface, I can browse backup contents and it seems that backups are all right. Same if I choose "check backup".
What could be the problem with my backups? Any idea what could be done to mount them?
Thanks!

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Thanks for your reply!
Yes, I did what you described. It works fine for me. I figure that the backup is not corrupt.
Still I can't mount it.
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When attempting to mount, select only #4.
Before telling it to do the mount, look at what drive letters it is attempting to mount but uncheck some of the partitions not needed.
I have had anti-virus program to prevent mounting and the AV may need tweaking.
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OK, that's what I do: with file #4 selected, I right-click it, chose Acronis -> Mount. The backup has only 1 partition, and for that partition I select drive letter X:, and press "Proceed". After that, I get the error message.
Turning off AV program did not help.
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At this pointing, I am guessing. Try selecting #3 (in case #4 has an issue) and use a different drive letter.
Also look at Windows Explorer and see if you have any other drives still mounted.
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Using different drive letters didn't help.
#3 gives same error, while #2 and base backup mount OK.
No other drives are mounted, exept my phisycal drives.
I'm afraid I'll have to give up here. For some other reasons I decided to actually try to restore that last backup. It restored successfully, so now I'm back to Windows 7 and ATI 2011, and everything now mounts fine. So I guess it's either some uncompatibility between 2011 and 2015, or some Windows 10 problem.
Thanks for trying to help anyway!
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