This morning I updated Continua from v220.127.116.117 to v18.104.22.1689.
I used the server installer on machine BM01, updating the server and agent.
I used the agent installer on machines BM03 and BM04.
After installation I checked the Agents page in the Continua administration screens.
The agent on BM01 was reporting as v22.214.171.1249 and compatible.
The agents on BM03 and BM04 were reporting as v126.96.36.1997 and not compatible.
I double checked I had downloaded the right agent installer (ContinuaCI.Agent.Setup_x64_188.8.131.529.exe) and reinstalled the agent on BM03 and BM04. I also restarted all three machines.
The same result. The agents on BM03 and BM04 reported as v184.108.40.2067 and not compatible.
I rolled all machines back to v220.127.116.117 using the appropriate installers and everything is working again.
Can you please check your agent installer for v18.104.22.1689. It appears the either program is reporting the incorrect version or the wrong version was included in the installer.