Searching for a way to often stems from a need for flexibility or a lightweight solution for 2D drafting. However, it is critical to understand that Autodesk does not offer an official "portable" version of AutoCAD LT.
Older licensed copy
Autodesk offers (formerly AutoCAD 360) — a browser-based version of AutoCAD LT. You can: download AutoCAD LT 2018 portable 64 bit
The official 64-bit version provides: