RTX 16x for Java v4 is a release file of the Minecraft resource pack RTX 16x for Java, made for Minecraft 1.16-Snapshot, 1.13.1, 1.15-Snapshot, 1.16.1, 1.14.4, 1.14.1, 1.14.3, 1.15, 1.16, 1.13, 1.15.2, 1.14 and more. It was published on July 25, 2020 and is 1.4 MB in size. For the full description, screenshots and every other version, visit the RTX 16x for Java resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.