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IBDac version is 1.10.0.10
When sample Demo compile error.

[Fatal Error] Unit IbDacVcl was compiled with a different version of
DBAccess.TCustomConnectDialog
[Fatal Error] Unit IbDacVcl was compiled with a different version of CRParser.TParser.
....

Why error occurrence?

refer:
1. IBDac trial version(1.00.1.9) was installed.
2. Trial version removed.
3. IBDac version(1.10.0.10) install.
4. compile error!

In use D7 and BDS2006.

I suppose that you haven't completely uninstall previous IBDAC version. To
do this try to uninstall IBDAC using "Add/Remove Programs" Windows control
panel applet. And then install it again.
If problem persists then, uninstall IBDAC, go to "Component/Install
Packages..." IDE menu and check that all of "CoreLab Data Access
Components", "Core Lab Data Access GUI related Components", "Core Lab
InterBase Data Access Components", "Core Lab InterBase Data Access GUI
related Components", "CoreLab Controls" packages are removed. Search DAC70.bpl (in case of Delphi 7) or DAC100.bpl (in case of BDS2006) on your hard drive and remove them.
Restart IDE to be sure that problem expired and install IBDAC again.