Which version of 8.1 is it? I found that 8.1 2016-08-02 would not run on latest Windows 10, however I took the executable from 8.1 2016-08-30, pasted it into the client folder, and then it worked.
Hi, Paul.
Sounds like you're talking about REST API. And that your are overwriting data with older values if B managed to read record before A finished to update it. Classic conflict resolution ...