Endless needed again

I was using pre installed endless on my PC then something happened to pc, i sent it back for Customer care services, now they returned it Window 10 pro, i would like to have endless again on my pc, any suggestions how to do the task and what are the risks associated with it?

https://support.endlessm.com/hc/en-us/articles/212890106-How-do-I-install-Endless-OS-alongside-Windows-