30 day free trial only supports 2 layers?

Question

I'm waiting for my company to issue a PO to buy the Standard Professional Educational version but I installed eagle 7.5 and used my Eagle Free Trial License code so I could get started on my 4 layer board design. On this page: EAGLE Free Trial has now ended it says that the Free 30-day trial is limited to 4 signal layers. But when I click on DRC in the PCB editor and add the other 2 layers (1*2*3*4), I get a dialog box saying :

"The layer setup contains layers 3,4, which are not available in the Freemium edition!"

Am I somehow using the wrong version?

Thanks,

Ed

autodeskguest · Answer

On 01/28/2016 02:21 PM, Ed Richter wrote:

Actually, it's (12+1516) for a 4 layer board with through vias.

That depends on the board stack-up. The asterisk ("*") represent a core

while the plus ("+") represents prepreg. One of the vendors I use

normally builds their 4-layer boards with one core in the middle and

prepreg on each side. This gives a stack-up of (12*1516).

It doesn't matter much if you're doing vias that run through the entire

stack, but it makes a lot of difference if you're trying to do buried

and blind vias.