Yes, it is for OpenAccess only. One possibility might be for you to do a quick-and-dirty migration of your design kit to IC61 by using cdb2oa on the design kit. Then import the spectre netlists, and then finally use oa2cdb to migrate the converted schematics back to IC5141 where you can do the Diva SVS.
Note that oa2cdb shouldn't really be used as part of a design flow, but it may be a workaround that's easier than writing your own LVS tool!
Do you have Assura available? If you can convert spectre to CDL (which is SPICE-like), which should be easy enough with a bit of perl, then you could use Assura to do an SVS. Diva LVS only takes a flat "Diva-syntax" netlist file, so it's going to be much harder to write a perl script to convert to that. You could (I guess) convert to CDL, import that in IC5141, and then do Diva SVS - but doing CDL import in IC5141 can sometimes be a little challenging to get all the device mapping correct, so I think that could end up being quite a lot of work...