You can download the entire software package here. The package includes the assembler source files, the hex image files and list files for all the software in this chapter.
The provided hex files can be burned into the PIC's flash memory with any appropriate programming tool. Many different programmers are available on the internet. If you don't have a PIC programmer yet have a look at Google and find the most suitable one for your purpose.
The assembler source files are written in my freely available SB-Assembler.
You can unzip all files into a subdirectory of the SB-Assembler and you'll be able to alter the source files and assemble them directly.