Yes, the epic website of arreat summit is down still, it's quite sad.
Have to use something else now then.
https://diablo2.diablowiki.net/Horadric_Cube_Recipes1 Lum Rune + 1 Pul Rune + 1 Perfect Emerald + Exceptional Unique Weapon --> Elite Version of Weapon
v1.10 and later only.
Ladder characters and single player characters only.
This recipe upgrades the item type of the weapon without changing the stats, and is useful to increase the weapon's damage.
Ethereal items, as well as socketed items can be upgraded without changing their nature.
Level requirements, as well as strength and dexterity requirements, will increase corresponding to the elite version of the item.