If don’t have a rip software, I recommend onyx. It’s $2500 which is one of the least expensive and it’s very easy to learn and use. It can also run just about every other printer out there when you get something different.
as above...
You can download a 30 day trial of Onyx Production House RIP, and use it...
or rent Flexi- the most recent version that supports L25500
or buy an old Signlab version 9 onwards + dongle...
All the best!