Now it seems to me that the “Cache” tab now correctly displays “server level” information, including the number of cached pages and their size, and the “Page Cache” tab displays “blog level” information. This is a normal state of affairs, I think. Especially if it is described in the documentation. If the problems with the installation are not widespread and I was the only one lucky (I mean reinstalling version 1.7.1 multiple times), then the plugin works as expected and is perhaps the best solution to date. Perhaps on the “plugin side” it is worth checking for salt generation. Or implement entering or creating a “salt” in the settings. Thank you for your prompt replies. I understand that now it is not fashionable to translate your products into Russian, but if you are interested in this, I could do the translation. Also, after using it for some time, I will write a review in Russian on my blog and possibly in WordPress services.