UniKey 4.6.2 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program is categorized as System Utilities.
Commonly, this program's installer has the following filenames: UniKeyNT.exe, UniKey.exe, UniKeyNTmgr.exe, unikeynt.exe and UniKeyNT.exe etc. The following versions: 4.3, 4.2 and 4.0 are the most frequently downloaded ones by the program users. This free software was originally developed by Pham Kim Long. This PC program works fine with 32-bit and 64-bit versions of Windows 2000/XP/XP Professional/Vista/7/8/10/11.
From the developer:
UniKey is the most popular Vietnamese keyboard for Windows. The core UniKey Vietnamese Input Method is also the engine for many Vietnamese keyboards in Linux, macOS and iOS. UniKey is very small, does not need any additional library. It quickly gained popularity thanks to its speed, simplicity, and reliability. It soon became, and still is the most popular keyboard program for Vietnamese language.
You may want to check out more software, such as Avro Keyboard, which might be similar to UniKey.