Do not delete mod archives during mod installation

[junip0r]

Problem description
When I install a mod by dragging and dropping from a file manager, the mod manager deletes the source mod archive from my downloads folder. I don't want the mod manager to delete the source mod archive.

Describe the solution
Add an option to not delete the source mod archive.

Alternatives
Make a copy of every mod I want to install, so that the mod manager does not delete the original - a tedious and frustrating extra step.

Additional materials
I apologize if this option is already present, but I don't see it listed in the mod manager options/advanced options.