Running memory is an old version, which can't be found, unless the previously downloaded one has not been upgraded!

Use your mobile phone, search for WeChat, and then there is the option of "version history" below, you can choose the early version of WeChat. The earlier the version, the simpler the function and the smaller the memory. You can try downloading the earlier version.

But the problem is, if the function is too simple, I'm afraid you can't use it now, so you might as well not.