: Users were restricted to two signal layers (top and bottom), making complex multi-layer boards impossible without a professional upgrade.
CadSoft explicitly offered a freeware version of Eagle 7.5.0. Autodesk has not retroactively revoked that license. You may not, however: eagle pcb design software version 7.5.0 free download
Finding a direct, official "free download" for EAGLE PCB Design Software version 7.5.0 is difficult because the software's owner, , has officially ended support for version 7.7.0 and older : Users were restricted to two signal layers