Copy the content of the pack to where your Sider.exe is (usually PES 2020 Folder) and then add these two lines to your Sider.ini config.
cpk.root = ".\GFXMOD"
lua.module = "GFX_MOD.lua"
Always place the GFX MOD CPK ROOT (LiveCPK) at the bottom of your LiveCPK folders of your Sider.ini
And the GFX MOD Module at the top of your list in Sider.ini and
Also, I recommend setting in-game Contrast and Brightness both to 50.