
This is a limitation of Acronis Bootable Media
This article applies to:
Symptoms
There is no possibility to restore files to their original location from Acronis Bootable Media. The option is grayed out:

Cause
The option is disabled, because Acronis Bootable Media uses Linux environment, and drive letter assignment rules in Linux are different from the ones in Windows. See Acronis Bootable Media Displays Wrong Drive Letters.
Thus, an attempt to restore files to their original location from Acronis Bootable Media would have unpredictable results.
Solution
It is only possible to restore files to a new location from Acronis Bootable Media.
More information
See also Acronis Backup & Recovery Bootable Media Created in Linux Fails to Restore Files or Folders to Original Place.