Problem increasing free space on logical drive

[scorpio77]

Hi there!
I've got DD suite 10 build 2117.
I'm trying to increase the free space on my logical drive ( D: ) by taking space from the primary ( C: ). At first DD (and Windows) tells me i have 21GB free space on primary, but after analysis when i try to move some of it to the logical drive it says theres no free space. Windows still show 21 GB of free space.
I've tried with installing new Acronis drivers from this link (http://download.acronis.com/support/SnapAPI.283_s_e.exe), found on the forum but same result.
Please help!

[Acronis Support]

Hello Scorpio77,

Thank you for using Acronis Disk Management Software (http://www.acronis.com/enterprise/products/diskdirectorsuite/)

Please note that to increase free space of a partition you should use "Increase Free Space" wizard.
There is one more way to increase free space. You can decrease free space on your system partition by chosing "Resize" operation , then change size of partition D: using appeared unallocated space with the help of the same "Resize" operation.

Thank you
--
Alexander Gladkov