If you're not using a mod manager, you'll need to manually extract the .esp file to your Fallout: New Vegas data folder. This is typically located in C:\Program Files (x86)\Steam\steamapps\common\Fallout New Vegas\Data .
Even advanced users stumble with this patch. Here are the most frequent issues. scar-adxp-patch.esp
Newer frameworks like and AMR have made the patch more stable than ever, but it is still a "glue" mod. Expect it to remain in your load order until Skyrim modding abandons Behavior files entirely (which will not happen soon). If you're not using a mod manager, you'll
after installing or updating these mods to generate the necessary behavior files for the animations to trigger correctly. Common Companion Mods SCAR - Skyrim Combos AI Revolution scar-adxp-patch.esp