Help/Support Grim Soul. Is it possible to log into an existing account?

[Денис Замятин 0 iPhone 15 26.5]

I recently encountered a problem that I hadn't had before. I used to be able to play the regular App Store version, then install the iOS Gods version and continue playing with my existing account. But now, every time I install it from iOS Gods, a raw version without any saves is installed, and I have to start over every time. 
If this problem can be solved, please suggest some options, as I can't figure it out at all. (Could it be that the game developer itself has disabled this feature? Or am I doing something wrong after all...)

[cutek1d 81 iPhone 15 26.0.1]

With sideloaded or modded IPAs you can’t log into an existing Grim Soul account. Free certificates don’t support Apple ID/Google login. If you want to use your old account, you need the official App Store version or a paid developer certificate.

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Через сайдлоад или мод‑IPA нельзя войти в существующий аккаунт Grim Soul. Бесплатные сертификаты не поддерживают вход через Apple ID/Google. Чтобы использовать старый аккаунт, нужна официальная версия из App Store или личный сертификат разработчика.