Question [Urgent] 32Bit to 64Bit without a flash drive/disk?

My friend needs help from me upgrading to 64bit but what slows me down is that he does not have access to a flash drive and cant buy one. He does not care about his files whatsoever and I recommended him to wipe his operating system on his hard drive and then go onto his siblings computer and install windows 10 installation media from there. Is it ok if i do this or is there another way to upgrade to 64bit without any other device? Yes his computer is 64bit compatible so don't ask.