@GarryJH ok i have delete the two folders in my C but...the missing space is still missing. i think i lost with 4-6 reinstall on C 6gb....for the price of getting nothing. on my side...all starts end ends with trying to download the 11gb from the store.
I was lucky I was able to reclaim around 50-60gb of space. However, I'm still missing around 10-20gb of space. Don't know where to look anymore as I've deleted all that has been discussed here, including the PHANTASYSTARONLINE2 folder in my C drive. Well, at least I got a lot of hdd space back.