Here are some known solutions that can help resolve "Installation data cannot be retrieved", "Unable to retrieve install data", "You do not have access to this widget", "No compatible SOLIDWORKS version found", "Can't open hosts file", "Loading registry ...", Download button not showing!, Error 20, 310, 1002, 1603, 1605, 1608, 1610, 1644 and the other installation errors. INDEX: ⚠️ PREREQUISITES TO AVOID INSTALLATION PROBLEMS: #A. LAN Permissions. #B. Disable antivirus, VPN, firewall or