I'm sure you can read that 1.1 update is already included in the main download. That means the one you've downloaded now already has them.
For the crash fix, just overwrite everything inside the main game folder (i.e. your SLRR folder) with the ones inside the .rar file. Remember that you should use them ONLY if the game actually crashes at startup before you even put mods inside it.
Same goes with the low res trees, excpet that you may use them anytime you like it.
Also a bit of suggestion: To avoid the hassle of creating new threads everytime you're looking for help, ask over here instead
Mitsubshi Lancer Evolution III GSR 'Silver Queen' - Main Daily, Real Tuning/Street class TA car
Nissan Silvia S15 Spec-S (RB26 swap) - Second/Open/possibly Turbo class TA car (WIP)
Nissan Skyline GT Sedan HR34 - Spare Daily #1, grassroot drifter
Daewoo Tico (D16 VTEC swap planned)- Kanjo car (WIP)
Mercedes Sprinter - Parts and trailer van (mainly for S15)
Chevy Silverado CK1500 (LS7 swap) - Spare parts truck, hobby drag car, gift from Side to Side crew
Nissan 240SX MS13 Convertible 'Kaede' - Spare Daily #2, kyusha car
Toyota Mark II JZX110 'Meme Machine' - Missile drift car, currently broken, will be fixed
Ford Mustang Foxbody Hatchback 2.3 (Ford Modular 4.6 swap) - No purpose at the moment, FOR SALE OVER HERE! CLICK ME HARD!
Yes, I own too many cars, thanks for asking. All offers on cars for sale via PM unless announced later