I downloaded and installed the 3.4.10 community edition on a dell workstation with 32g RAM.
The system start as a console, with the standard .conf file.
I just tried to enlarge the heap as follow:
but it doesn't want to start.
PS I:\neo4j-community-3.4.10> bin/neo4j console
Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap
There is nothing special running on the machine: just windows 10 pro and sublime text 3, both using 7gB, so at least 25gB are free and available