Regarding the issue of player records disappearing when upgrading from a very old version to version 2.6, this is primarily due to changes in the save file path made by the RPGMAKER game engine.
The original path was:
steamapps\common\诅咒铠甲\save
Here, you can find your old record files and paste them into:
steamapps\common\诅咒铠甲\www\save
Currently, Curse Armor also supports cloud saves, so after placing them in this location, they will be uploaded to the cloud.
From now on, your saves should no longer disappear.