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If you use Aurora Store instead of the Play store, you can download APKs. They are a Google Play store proxy.

Is there a way to conver that xapk format to apk other than installing their app?

yes, unzip it.

I have many apps that refuse to work. They try to open play store app which does not have logged in account.

The app doesn't work

The aurora store will identify whether apps require google play services before you try to install them.