I’ve never tried to make a boot animation myself – only used ones that
others created. I’m not sure what exactly is causing yours to not work.
You shouldn’t need the old file called .old, that doesn’t make sense. It
could be how the file is zipped. Did you use Window’s built-in zip
reader? If so, you could try downloading 7-zip, which is free and
awesome. Windows may (probably) add other stuff to a zip file because,
like a spoilt child, “they don’t care – they do what they
want”.

I did find this page that explains the boot animation process nicely.
http://www.dkszone.net/how-to-create-custom-boot-animation-for

Happy New Year and good luck.