FEMtools 4.1.1은 버그수정 및 몇 가지 개선사항을 포함하고 있으며 아래의 추가사항을 제공하는 유지보수 관련 버전이며 4.1 고객에게는 무료 설치가 가능하다.
      - In order to comply with Microsoft logo requirements, all FEMtools EXE and DLL files (Windows) are digitally signed
       and timestamped.
      - New material and geometry parameters directly referring to the material and geometrical properties indexes.
      - Support for SAP2000 v21

FEMtools 4.1은 Framwokr 및 Pretest Analysis 기능을 개선 한 주요 새 버전이며 해석-시험 상관 관계 분석, 민감도 분석 및 모델 업데이트는 변형(Displacement) 응답을 지원하고 FE 데이터 인터페이스 및 드라이버는 현재 버전의 FE 프로그래을 지원하도로 업데이트 되었다.
아래는 4.1 주요 Update 내용이다.

     General

      - Support for the new Sentinel HL Pro Driverless dongle is added.
      - User's Guides updated to 1600+ pages.

   
      Framework

      - Conversion from linear to quadratic elements added.
      - Automatic generation of surface elements from test model tracelines.
      - Improved expansion of test mode shapes.
      - Improved interactive mode Shape Pairs Editor.
      - The FEMtools database now supports strain and stress tensors, computed internally or imported using data interfaces.
      - Tables now support display strain and stress tensors.
      - Code optimization for long combo-boxes resulting in factor 50 speed increase.
      - A new graphics capture tool is added for capturing and resizing a graphic window.
      - A new button to set the center of (dynamic) rotation.
      - A new Animation Control dialog box.
      - Curve trackers can now be moved suing the keyboard arrow buttons.
      - For shape animation, the color-coding can be set to follow the deformation amplitude.
      - The number of contour intervals and custom legend colors can be specified.
      - Code optimization of graphics rendering leading to speedup factors of up to factor 10.
      - Graphics viewers now support display strain and stress tensors.
      - The formulation for QUAD8 elements is improved for more robustness and higher speed.
      - The FEMtools solvers now support ILP64 (8 bytes) integer indexing, enabling larger datasets.
      - Computation of static and omdal stress and strain has been reworked and now includes support for 2D and 3D elements.
      - Support for selecting strain responses is improved with support for stress component and element face selection.
        Specifying a coordinate system an now use an Automati mode.
      - There are 25 new FEMtools API functions to supprort script development.

    Data Interfaces

      - Support of Abaqus 2019
      - Support of Ansys 19.4z
      - Support of MSC, Nastran 2019
      - Added supprot for static displacment and strain analysis in the Abaqus, Ansys and Nastran interfaces and drivers.
      - Like the Nastran interface, the Abaqus and Ansys interfaces now also support import of mode shapes based on mode number
        and on frequency ranges.
      - Support for SAP2000 v20

    Analysis

      - Improvements to Modal-based Assembly (MBA)
      - Automatic traceline generation has been reworked to support larger point clouds like produced by full field testing.
      - It is now possible to do manual sensor selection on a FE model without the need to compute or import the shapes.
      - It is now possible to import a test model and use it as a pretest model that can ve edited
       (sensors added, remoed, moved) and used in the Rotate Sensor panel.
      - New examples for static displacement and strain-based correlation analysis and model updating are added.
      - Support for strain responses is added.