I want to use an old version of Google Play Music but I can't.

So, I like the old Google Play Music app. It was simple and worked just fine. YouTube Music is clunky, and I don’t stream my music anyway, it’s all on my phone.
However, even with me disabling automatic updates for it, my phone will still update it after a day or two.
I tried re-signing it but then after uninstalling it and installing the resigned version it just crashes at start.
Is there any way, without root, to keep the app from updating or getting another signature to work with it?

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Source: XDA