This update broke my server (steam=0). It seems to crash as it's trying to do a backup before starting:
ERROR: General , 1645886611613> 678á445á311> Exception in thread "main" ERROR: General , 1645886611613> 678á445á312> java.lang.NoClassDefFoundError: org/apache/commons/compress/archivers/zip/ParallelScatterZipCreator
ERROR: General , 1645886611617> 678á445á316> at zombie.core.backup.ZipBackup.makeBackupFile(ZipBackup.java:75)
ERROR: General , 1645886611617> 678á445á317> at zombie.core.backup.ZipBackup.onStartup(ZipBackup.java:47)
ERROR: General , 1645886611617> 678á445á324> at zombie.network.GameServer.main(GameServer.java:623)
ERROR: General , 1645886611629> 678á445á326> Caused by: java.lang.ClassNotFoundException: org.apache.commons.compress.archivers.zip.ParallelScatterZipCreator
ERROR: General , 1645886611629> 678á445á328> at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
ERROR: General , 1645886611629> 678á445á330> at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
ERROR: General , 1645886611629> 678á445á331> at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
ERROR: General , 1645886611629> 678á445á333> ... 3 more
C:\ProjectZomboidDedicatedServer>PAUSE
Update: I found the "BackupsOnStart" option and played with that and BackupsCount. It seems a bit random, but setting BackupsOnStart to false and BackupsCount to 0 I managed to get the server started. The first time it didn't work, and BackupsCount goes back to 5 on startup attempt, but I set it back to 0 once again and that time the server did start. I'm not touching it now, because this was me and my partner's planned activity for the moment and I don't want to risk ruining it now that the server is finally back up.
Update2: Turns out there was also a client/server mismatch for ISVehicleMenu.lua. I sorted that out manually and everything seems OK now. For clarity, I'm using the GOG client.
Update3: Except my main vehicle now has a red engine light and refuses to even try to start, even though everything is in the green in vehicle mechanics. Other vehicles are working so I guess I'll just have to try to find one with sufficient cargo capacity to limp back home in.