For errors like "Network data is successfully received, but not processed. If the game was recently updated, an update may be required for FFXIV_ACT_Plugin." may be caused by different versions of each server (especially the global/Chinese version).
The default download method in ACT may not support the current version in China (the latest version is downloaded by default, but they may be several minor versions before), resulting in reverse version problems. Can simple solve it by checking the version of their current server and returning to download the corresponding plugin version, installing it from the dll.(e.g when 2025.5.9,latest adapted game version is 7.21, but the Chinese one is 7.15, which makes it impossible to parse.)
Should the corresponding information be added in the guide? I searched for issue but there was no such answer. Or just close this issue save as subsequent search content also ok.