: Windows 8.1, Windows 8, and Windows 7 SP1 (64-bit). Unsupported Systems : Windows Vista and Windows XP.

Tekla Structures 21.1 is strictly designed for older business-tier Windows versions. It is not officially supported on Windows 11. Tekla User Assistance Supported OS:

"That's not how it works," Sarah pressed. "Tekla 21.1 isn't just a fresh coat of paint. The rendering engine is heavier. The database management for the rebar detailing is intensive. If we push this onto the current hardware, the models will lag. We’ll be looking at a five-second delay every time they rotate a 3D view. That’s five seconds, times a thousand clicks a day, times twenty drafters. We’ll miss the deadline just waiting for the screen to refresh."

The Tekla installer usually handles these, but ensure your system is compatible with these redistributable packages: Tekla User Assistance Microsoft .NET Framework 4.7.2 (or newer). Microsoft Visual C++ 2010, 2013, and 2015 Redistributables (both x86 and x64). Tekla User Assistance Display & Peripherals : A resolution of 1920 x 1080

No. Because 21.1 is over 7 years old, any CPU or GPU manufactured after 2019 is "wasted" performance. Instead, buy refurbished enterprise hardware:

The firm had just landed the contract for the "Zenith Tower," a forty-story mixed-use skyscraper that was going to be the jewel of the city’s skyline. It was the kind of project that made careers—or ended them.

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