Are you using a or an on-premises network server ?
Understanding Tekla Structural Designer 2021 Licensing and Activation Tekla Structural Designer 2021 Product Activation Key
Avoid downloading "product activation keys" or "cracks" from unofficial blogs or third-party file-sharing sites (e.g., Google Drive links found in search results). These files often contain or ransomware and violate software license agreements. Always use official resources from the Trimble User Assistance portal. I cannot activate my Tekla Structural Designer PAK Are you using a or an on-premises network server