The SDK libraries (aar libraries) are in the commonlib and mobilertc folders located inside the mobilertc-android studio folder. Ensure that the following files are included in these folders. If you find anything different or missing, re-download the SDK.
However, downloading the archives zoom-sdk-android-5.17.1.18530.zip or zoom-sdk-android-5.17.0.18337.zip do not contain commonlib.