Since you don't have S32DS v3.4.3 in your account and you have already updated it, I don't know why you still need to download it.
Please try to install a new S32DS v3.4, for example: C:\NXP\S32DS.3.4_S32K1_SDK403
Then update the S32 Design Studio Platform package and S32 Design Studio Platform Tools package 3.4.3, then update the S32K1xx development package, and finally install S32SDK S32K1XX RTM 4.0.3
By the way, for new projects, we recommend using the latest S32K1 RTD 2.0.x + S32DS v3.5.