Hi, I bought a DVD with Windows 8 32 bit version, but I wish to clean install 64bit version because of 4 gb ram. I am in misunderstanding which version to install now. On dvd label is x18-06522-01, but near hole is x18-15876, disk name is HRM_CCSA_X86FRE_EN-GB_DV5. Which version ISO file I have to search? Is it possible to get iso with last 8.1 version? I tried upgrade assistant, but it says key is not working.