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Installed 4.00.07 under Delphi 7. Tried compiling the demo and got the following error message:

Unit MemUtils was compiled with a different version of zlib.zlibAllocMem

Now, the FAQ states uninstall, manually clear all (if necessary) and reinstall. Having tryed that twice with same results, I decided to ask on the forum.

Any suggestions would be welcome.

Do you have any other DAC products installed?
The product compatibility is provided for current build only.
In other words, if you upgrade either of the installed products it
may conflict with older builds of another ones. In order to continue
using products simultaneously you should upgrade all of them at the
same time.

No other DAC products installed

As we know, TurboPower adds ZLib files that are different from Delphi ones.
Try to comment (rename) file zlib.pas from the TurboPower installation directory, and remove all dcu files from "Unit output directory" of your project (see Project Options), and run the project.