Hello @sandeepSingh18606,
How did you install it if it is not listed?
First of all, you need a version that is compatible with your RTD release.
According to the SPD release notes:
SPD v1.0.3: This SPD version is compatible with S32K3 Real-Time Drivers Version 3.0.0 and 3.0.0 P07.
SPD v1.0.4: This SPD version is compatible with S32K3 Real-Time Drivers Version 4.0.0 and S32K3 Real-Time Drivers Version 3.0.0 P07 (Tresos version for the S32K324_MAPBGA257 derivative).
The newer versions, v1.0.5 and v1.0.6, are compatible only with newer RTD releases.
Download the update site ZIP package, for example: S32K3_SPD_1.0.3_DS_updatesite.zip
Then add the update site in S32 Design Studio under Extensions.

Thank you,
BR, Daniel