You will find an answer to many of your questions in the Q&A section of the Support Forum.
Visit the Tekla BIMsight Help Center or use the Search function to find what you are looking for.
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Tekla offers updates to Tekla BIMsight. Minor updates (Tekla BIMsight version 1.X.X) fix defects that have been found and major updates (Tekla BIMsight version 1.X) add new functionality. The most recent version is always available on the Tekla BIMsight website and a notification of an available update is shown on the Home tab of Tekla BIMsight.
When an update is available, download the new version and perform an administrative installation to update Tekla BIMsight on users’ computers. We recommend that the latest available version is always used.