To add to the answer here. It's not just Wonde that will cause this. Any third party system that accesses SIMS via the command line importer will cause the SIMS update to fail. For example Inventry. The problem is that Solus doesn't realise SIMS files are occupied before it runs the update.
If you close all third party services before you run the update then it should prevent this from happening. Another thing to check is after the update try to open the SIMS.net client on the server. If you have an issue you will find it does not open. A full reboot of the machine also is what is recommended to solve this.