The red label "Incompatible" means that the package is collected under a different version of the game: "(Done for an older version of Minecraft)" or "(Done for a more new version of MineCraft)". It's still possible, the game will ask again, "Do you really want to download this set?" The pack often works almost entirely, but the textures of the objects that have been renamed between versions will not rise.
What version the pack is built for is indicated by the number in its pack.mcmeta file - a table of numbers on the page pack_format. You can rewrite the number to suit your version in pack converter, and to make out what’s inside the pack - in parsing the resource pack.