Don't modify data-1.1.0.pk3 AT ALL, that includes extracting and recompressing it. Create the same folder structure as in data-1.1.0, and put ONLY your own models in the right place, then zip it up and rename to .pk3. For example to replace the blaster model, you create 'models/weapons/blaster/' and put your own blaster.md3 in there, then compress the 'models' folder with the stuff inside it into 'whatever.zip', and rename to z-myblaster.pk3. Also you should try better English so others can understand you, and don't use the phrase "downt work", say what exactly is wrong, like "getting error <error here>" or "there is no difference, my models are not being used". Always check console for warnings and errors.