@BloodyKyona The old version of the graphics engine is not going to be available after the update.
Note that the requirements for the engine update are still pretty low, the graphics card in the minimum requirements was a $80 graphics card in 2010.
The biggest increase in the requirements is probably the need for AVX support in the CPU, but almost every CPU since 2011 has supported AVX, except for Intel Pentium and Celeron series.
Well it's tricky. Computer isn't that old, but is a laptop. Intel Core i7 5710 HQ processor, NVIDIA 860M video, 8 GB RAM. It already gets hot playing PSO2 on the lowest settings, hence my worry. The computer was bought in 2013-2014 when it was middle-upper tier for laptops. My new computer will run it just fine, but we only really play the game together.