Hello,
Unfortunately, this software was not published and is no longer maintained. Therefore you cannot find it on the NXP site.
However, you can look at the official bootloader:
Serial bootloader AN12218:
https://www.nxp.com/docs/en/application-note/AN12218.pdf
https://www.nxp.com/docs/en/application-note-software/AN12218SW.zip
Or SDK Bootloader application provided by S32DS: RApplD BL Tool
I hope it helps.
Best Regards,
Diana
