Last night I've downloaded GT: OS from GamerGate.
If you've downloaded it later than september 2013, it is sep13 already. For reference, the setup file is gtos_setup_sep13_eng.exe.
If so, I only need to install:
1. gtos_patch_dec13a_eng.gt2extension,
2. gtos_patch_may14_eng.gt2extension,
3. gtos_hir_tex_01_jul13.gt2extension (High resolution textures DLC).
Is this correct?
Almost, this one isn't needed: gtos_patch_dec13a_eng.gt2extension. gtos_patch_may14_eng.gt2extension will replace it, Graviteam's patches don't require previous versions to be installed.
I don't have to install "apos_upd_tar_rak_mar13_eng.gt2extension" (Polygon update) and "gtos_cu_581c1_eng.exe", right?
Right.