Hello
Architecture mismatch means that you are using 64 data connection with 32 bit application or 32 bit data connection with 64 bit compiled application.
BI Client tools are using 32 bit (x86) drivers. you can open ODBC 32 bit administrator from SAP Bi platform Client tools or C:\Windows\SysWOW64\odbcad32.exe
Also can happens if your installed driver is incorrect.
I hope it helps,
János