I'm very new to mods but tried downloading a few. The mod I'm trying to download (1.17.1 packed up) that "requires supermartijn642corelib 1.0.12 or above, and below 1.1.0" but I couldn't find this anywhere. I tried to download some of the more recent versions but I keep getting this error message. Image attatched

nevermind I found and downloaded the 1.0.12 version aswell as the 1.0.9 version