The most common fix is ensuring your system has the correct C++ libraries.
A frequent cause is attempting to load a 32-bit plugin into a 64-bit version of Rainmeter, or vice-versa. Rainmeter.dll Load Error 126
If you recently upgraded from 32-bit to 64-bit Windows, your old Rainmeter installation might still be trying to use 32-bit plugins. The most common fix is ensuring your system
Visit the official Rainmeter redistributable page or the Microsoft Support site . Rainmeter.dll Load Error 126