Only users with LWCAD 4.0,4.1,4.2 or 4.5 are eligible to download free upgrade.
Please download LWCAD 4.51 upgrade here!
Before installation please uninstall previous version:
Then install new version 4.51:
No activation is needed when upgrading from version 4.0,4.1,4.2 or 4.5 to version 4.51
Steve White author of LWCAD preset pack released two helpful LWCAD tutorials: