setting so that players who come on my server to download the texture I want tive use one wanted them in HD as it enters
there's a texturepack setting in server.properties Just put the URL to the .zip file there. If it's a HD texture pack, they'll need to have a modded/patched client!
if it is possible, the only way it will work is if all your players have the required mods installed to use the hd packs (this is not the case for a lot of people) NOTE: they can of course choose not to use your texture pack, if that is what they desire
it is up to you really, those who can use it should be able to use it fine, but people who can't use it will probably crash if they try using it, but since they can choose not to use it, if they read what they are clicking, it should be fine, but honestly not many people will read, and they will crash themselves, and won't be able to get their minecraft to start up again until they delete the texture. (so in the end this is very risky, but fine if it is a small server for your friends who all use HD packs)