So ill start by answering the easiest question. The old version of the fight doesnt exist anymore. That doesnt mean we cant get you past this one though. For the time being, everything i write will be assuming that you intend to do this fight on your highest level class - your black mage. So i started by looking at your gear via a character search. Most of your gear is fine(well above what anyone would normally have when doing the fight), but im curious what your thought process is for the weapon. Its easily your worst piece, and weapon is the most important upgrade to make in terms of upgrading your damage(this is true for every class, not just BLM). Something as cheap as a Yeti Staff(hq) will likely make a much bigger difference for your spell damage then you might guess, and the shield isnt really benefiting you like you might have hoped. The devs decided that BLM(and WHM too actually) were better served by using 2-handed staves/canes, and moving forward the 1h+shield option is no longer available.

Beyond that, what part of the fight is actually killing you? I watched the video you linked, and it seemed like a fairly straightforward fight to win(and indeed, the SAM did win). Slow easy to read attack telegraphs, nothing super tricky. One lesson every BLM must learn when doing solo fights is that sometimes breaking off a cast is better then eating an attack. And once he starts setting down those big patterns, he seems to mostly stand still for a bit to set them off - plenty of time to get in some hits after getting out of the way. Other "new player traps" ive seen include kiting. In general, it doesnt work so dont bother. It causes you to lose a ton of attacks, while the enemy isnt actually that put off. When you dont need to dodge a big move, stand your ground. You can hit Surecast if youre getting interrupted a lot(typically isnt an issue), and it might not be obvious but BLMs actually have the best defensive move in the game outside of the tank classes - Manaward. Being able to pick and choose where you can just strategically ignore a move because it wont overcome your shield is amazing. Im guessing its a very strong move to pop at the start of the last phase.

And the final thing to consider is rotation. The BLM rotation at 50 is easy enough, but the way the spells are worded causes some players to mistake the way they are meant to be used. The simplified version you should use would be this: Bliz3 Thun3 Fire3 Fire1 F1 F1 F1 F1 F1 B3 and repeat. If you get any Firestarter procs add them in. At higher levels you sometimes want to save them to give you a spell to cast while running, but for a fight like this a lost second or two of uptime isnt the end of the world. For Thundercloud procs, try to save them to replace the next T3 you need to cast(though using them early isnt the end of the world either). I can explain the theory behind all of this if it doesnt make sense, and while there is a less simplified version this should be more then enough to handle this fight. And finally, old caster adage: ABC - Always Be Casting. If you arent moving to dodge an attack, you should be flinging a spell every second of the fight.

If all that isnt enough to get the old Roe down, then something is missing and you need to provide more info.