Contact FileMaker sales or a dealer of your choice?
It could be they sell you FM 14 with downgrade.
PS: On the long run, you may want to upgrade.
This site sells archaic software but I've never used it
There are a number of similar sites if you search around the internet. I believe filemaker has discontinued both support and sales of the version 11 a while ago though.
However, Filemaker 11 is beyond end of life support, and is now over six years old. Maybe it's time to bite the bullet and upgrade?
I thought FMI stopped selling the downgrade for 11 when support was discontinued for it.
i am in a similar situation. FMI wouldn't sell me a downgrade even when 11 was supported. Currently they have responded that it is impossible For them to generate new license keys for anything before 12. I have to find a retail box or lose the work to someone else.