dpa_dsa.h is not installed in my \PellesC\include\ folder
If "dpa_dsa.h" is in your project folder then use #include "dpa_dsa.h" not #include <dpa_dsa.h>
I also recommend that you remove SPACES from your project PATH.
And lastly:
On my PC, dpa_dsa.h was found here:
Directory of C:\Embarcadero\include\windows\sdk
02/19/2021 04:55 PM 13,182 dpa_dsa.h
1 File(s) 13,182 bytes
Directory of C:\Program Files (x86)\Windows Kits\10\Include\10.0.20348.0\um
05/07/2021 04:17 PM 13,094 dpa_dsa.h
1 File(s) 13,094 bytes