System: Windows 10 Home
Browser: Google Chrome (last version)
Adobe Flash Player: 30 PPAPI
The program doesn't work. It's either asks me to reinstall or says that it's not suitable for my region.
Looks like you're attempting to use a plugin that is not available in your region. If you're in China, the you would need to download and install the China-specific Flash Player plugin. If you're not in China, but downloaded Flash Player in China, you'll need to uninstall Flash Player and re-install it.
However, you're using Google Chrome, which embeds Flash Player PPAPI, as such, there's no need to install Flash Player PPAPI plugin separately. However, Google disables Chrome Flash by default. See Use or fix Flash audio & video - Computer - Google Chrome Help for assistance.
Where can I download China-specific Flash Player plugin?
From official site it says that it's unable to install.