Hello Sharon,
That makes your previous version 3.0.x. Confusing I know. DB and program versions stay in sync since 3.5 now.
So, that makes the upgrade price from v3.0 to v3.6 $69.
What you should do, is to purchase the 3.0 to 3.6 upgrade license, install 3.6 onto your system, run it, activate the license, then restore your v3.1.5 database backup. Then you will be all set.
One thing to consider is that the taxonomic lists in your database are very old 7+ years. Many changes have occurred since then. If you wanted to upgrade to the latest, then you will want to consider that.
Please see the instructions on this web site: Product Info >> Upgrading from 2.x or 3.0. This lays out all the options.
Let me know if I can assist further.
Jeff |