HOW TO INSTAL SRO and why (R)?

I try install new client on my comp, and now - I have questions:

1) why I should take sro-R not normal sro - whats a difference

2) I play on SHIVA_LOOK chara by 5 years, and now it makes some problems with instal. If new client needs more memory?

I dont understand. Thx for helpin.

SHIVA_LOOK

ok, simply you are back from a while
well, lets sum up
SRO is the SRO ou have always know(except some minor details or more lvl cap)
SRO-R is a Revolution(atleast thats what the R stands for) of old SRO. It has some other aspects that are new to SRO but mostly it is just a formula change(on xp gain) and some new skills. Also a new job system

as for the second point, can you be more specific or post a pic of the issue please?