I found the same problem, so I install the DC 2000.5 before VSS 2000.2, however I couldn't get my VSS 2000.2 working with the 2000.5 license.
I get some error message and resolve some by setting the SYNOPSYS_SIM to my VSS installation directory and set the ARCH to msvc50, and come to the following error message that I have no idea.
C:SYNOPSYSMSVC50SIMBIN>vhdlan
**Error: vhdlan,317:
snps_setup fatal error: time resolution setting is not allowed.
Could anyone give some hints?