I'm trying to load the test script for Mult.asm but every time I do it says,
"...projects\04\mult/Mult.hack doesn't exist"
You need to use the supplied assembler to convert your .asm source file to a .hack binary file.
From section 4.4: Project
2. Use the supplied assembler (in either batch or interactive mode) to
translate your program. If you get syntax errors, go to step 1. If there
are no syntax errors, the assembler will produce a file called
projects/04/mult/Mult.hack, containing binary machine instructions.