Trick or treat, everyone! I just uploaded a Halloween resource pack for the month of October. This resource pack is mainly comprised of music, so the amount of textures that have changed are low. Only a select few entities have had their texture changed.
This pack is a heftier one, so when is asks if you want to download it and you say yes, it’ll seem like nothing happened. Just wait a minute and it’ll start downloading. Don’t be discouraged if you disconnect from the download. It should work when you reconnect.
If the resource pack still doesn’t seem to be working, consider erasing your previous cached resource packs in your Minecraft folder. More info on how to do that here.