I was trying to download construct on my laptop but it says d3dx9_39.dll is missing from your computer. Try re-installing the program to fix the problem. I tried re-installing it multiple times but it never happened.
Seems you have a problem with directX
here a link to reinstall it
it says a newer version is already installed and when I included the dlls it says it is unable to start correctly (0xc000007b). Click Ok to close the application
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I guess it depends on what version of windows you have. The latest I've tested as working is win7 32bit I believe.
That dll is an update for dx9. Typically you get it installed with dxwebsetup.exe that's in Construct's install directory. The link fm4fanAT posted should be basically the same. If windows won't let you install it then that's an issue on their end,
Copying dlls over manually probably has it's issues as well, such as other dlls it depends on or relying on 32bit windows or something. It probably can be done but I'll probably not look into it further.
You could always look here and see if this works:
I can also confirm that CC works on Windows 7 Pro x64.
I haven't done too much testing myself, but CC also seems to work on my Windows 10 computer, though it did give an initial error message saying that I needed DirectX8 or higher (I believe my computer has DX10).