The portable version is exceptionally lightweight and compatible with almost all modern Windows versions:
Fully compliant with Unicode for web/modern apps and ANSI for legacy software like older versions of Photoshop.
Approximately 12–15 MB, making it easy to store on even the smallest USB drives. How to Use It Portable Avro Keyboard and Spell Checker! - OmicronLab!
Supports traditional layouts like Probhat, Munir Optima, and National (Jatiya).