Hi @s32k146_ige
Firstly, the S32K1 Real Time Drivers AUTOSAR 4.4 Version 1.0.0 is delivered as an Update Site for S32 Design Studio v3.4, so it is recommended to use it preferably in this version of IDE.
To install this RTD version you need to download the S32K1XX_RTD_4_4_RTM_HotFix01_1_0_0_DS_updatesite_2109.zip. Once you have it, at S32DS Extensions and Updates click Add Update Site and select the zip file, then click Open, you need to select the file and then Installed.
B.R.
VaneB