No, the Lattice Standalone ispVM System does not require license.
User can download the Lattice ispVM Standalone tool or other older tools from our Software Archive page on Lattice website www.latticesemi.com > Support > Legacy Devices Software > click FPGA Software Archive > Under Documentation Archive > Under Downloads click downloadable Software button and find required tool.
Here is the direct link to the Software Archive page - http://www.latticesemi.com/Support/SoftwareArchive.aspx