There seems to be a "FATAL ERROR" message when trying to load the saves. Is this a bug for lower-end computers? It happens every time when loading a save
I'ld need some more information. Especially the crash log.
The Crash log is located inside the Bronze age folder.
See if it contains any information as to why the game might have crashed. It should say "FATAL Exception" and have a timestamp at roughly the time it crashed. Try to copy that part and post it here. Or just send the whole file.
Alternativly you could also send me the save file.
There are save incompatabilites between some of the beta versions of bronze age. If you played the old version of the mod for bronze age .90 those won't work anymore. There might be some incompatabilities between newer versions. If you started the save in an older version that might be the case. There shouldn't be any problems running the mod on lower end PCs apart from the lag.