Select Install , find the Lineage zip, and swipe to flash.

If you are looking for this specific "unofficial" build, you are likely trying to breathe new life into an aging tablet while maintaining the stability of the 3G radio and system performance. Understanding the "gtel3g" Build

If the tablet feels sluggish, set this to "At most 2 processes." Why stick with 14.1?

Once booted, the can be further "fixed" for better performance:

While newer versions (Oreo/Pie) exist for some variants, remains the "sweet spot" for the Galaxy Tab 4. It provides the security of Android Nougat without the heavy RAM requirements of newer versions, ensuring your 3G tablet remains a functional media and browsing device.

LineageOS 14.1 on older hardware can struggle with modern Google services.