Translated using Google Translate:
"I made a tool using the Model Builder and when I copy it to open it on another computer, the tool disappears. What can I do?"
Are you using ArcMap or ArcGIS Pro? version?
Could you share a screenshot of the model inside model builder?
How did you save/copy/open the tool?
Please share screenshot of the tool in source machine and how the directory/ TBX looks like in target system.