Once you have a legitimate LaserCAD_V7_Setup.exe file, follow these rules. LaserCAD V7 was designed for Windows XP and 7. Installing it on Windows 10/11 requires tweaks.
Unzip the folder completely before running the installer. lasercad v7 download link
Assuming you find a safe, working link, how does the software hold up? Once you have a legitimate LaserCAD_V7_Setup