Hello! Can you please try downloading the Tekla Structures Learning installer again? It seems that this error might be caused by a corrupted installation package.

If it doesn't help, could you provide some additional information:
- Does the installation stop at the beginning or in the middle of the installation process?
- What is the size of the installation package?
- Which operating system are you using?
- What is the language of the operating system?
- Can you see any log files created in temp folder (browse to %temp% with file explorer) when the installation starts?