@Alprins55555 invalid package is because you do not have root and are trying to use unsigned version. existing package is because you already have a version installed but signature is different from current. either you have installed from play store or another person's app
I just did as you said and lost all my progress as I'm not root and not able to sign into google account. tried the rename trick on the obd/data folder but game still reset
There is a bright yellow warning on the first page about this. clearly you didn't read the details.
If you enable 1 hit kill, you will get Something went wrong error after finishing mission, but mission still completed and lets you claim items. This may not work on some missions