Need help to get some OVA file to setup server

If the OVA you are talking about is for F5 VE, here is the link for the latest version:

 

https://downloads.f5.com/esd/ecc.sv?sw=BIG-IP&pro=big-ip_v12.x&ver=12.1.2&container=Virtual-Edition

 

There are multiple versions, so you need to select the one for your hypervisor.

 

Support matrix for hypervisors in case you need:

 

https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ve-supported-hypervisor-matrix.html