You can dowload from here:
This is unofficial version of Kip R. Irvine portable assembly.
cd <ASEM-I01_Irvine_Portable> folder
For build *.asm file, you can write without *.asm:
asm32 <fileName>
For run:
<fileName>.exe
For build:
cd <ASEM-I01_Irvine_Portable> folder
asm32 helloWorld
For run:
helloWorld.exe