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I am getting the error "INVALID_SIGNATURE" when I try to install an app from the Firefox OS Marketplace

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I own an LG FX0 smartphone running Boot2Gecko 2.1.0.0-prerelease as its operating system. It is still my "daily driver" smartphone, i.e. I use it everyday as my primary phone, and because of that it currently has an active phone and data plan with AT&T. I saw the announcement that the Firefox OS Marketplace was going to be shut down at the end of the day on March 30, 2018 (tomorrow). Because of this, I wanted to take one last search around the Marketplace today and see if there were any desirable apps that I didn't yet have installed, because as I mentioned above after tomorrow there will unfortunately be no way for me to get them. However, every app that I tried to download from the Firefox OS Marketplace today refused to install on my phone with the error message "INVALID_SIGNATURE". Please tell me that there is some way to correct or at least work around this issue so that I can still download and install some final apps from the Marketplace-- it is heartbreaking enough that Mozilla has decided to shut down the Firefox OS Marketplace to begin with, but it would be a real final kick in the teeth to this Firefox OS phone user if Mozilla broke the app store early and I couldn't install any last-minute apps while the Marketplace was still open! Any assistance or suggestions with how to resolve this issue are appreciated. Thanks in advance!