Cydia Impactor Old Version
STEP 3: Download Cydia Impactor and extract the archive. STEP 4: Open/Run Cydia Impactor on your computer then connect your iOS Device and wait until your device name shows up on Cydia Impactor. STEP 5: Once your iDevice appears, drag the modded.IPA file you downloaded and drop it inside the Cydia Impactor application. Impactor, created by saurik, is a free tool allowing you to install iOS applications without the need to jailbreak your device. Learn how to use Cydia Impactor to install IPA files on iOS 12 - 10.
This post is only for discussion of Cydia Impactor, the Windows/Mac/Linux utility. Go to this thread if you're having issues with Ext3nder or Ext3nder Installer on your iOS device.
Credit to /u/chaldeans, whose post was my initial source for this fix.
Cydia Impactor 0.9.44 was released earlier this week to fix a signing issue, which gave the error provision.cpp:138 maxQuantity. Unfortunately, it introduced an issue that prevents certificate revocation, giving error provision.cpp:81 when installing an app, and/or progress.hpp:87 when revoking a certificate. Hopefully, Saurik updates Impactor soon to fix this issue.

To successfully sign your apps in the mean time, you'll need Cydia Impactor versions 0.9.43 (0.9.42 on Mac) and 0.9.44. Here are download links, direct from Saurik's website (not embedded for transparency):
Cydia Impactor 0.9.39 Download
Version 0.9.44
Windows: https://cache.saurik.com/impactor/win/Impactor_0.9.44.zip
Mac: https://cache.saurik.com/impactor/mac/Impactor_0.9.44.dmg
Linux 32-bit: https://cache.saurik.com/impactor/l32/Impactor32_0.9.44.tgz
Linux 64-bit: https://cache.saurik.com/impactor/l64/Impactor64_0.9.44.tgz
Version 0.9.43 (0.9.42 on Mac)

Cydia Impactor Old Version Mac
Windows: https://cache.saurik.com/impactor/win/Impactor_0.9.43.zip
Mac: https://cache.saurik.com/impactor/mac/Impactor_0.9.42.dmg
Linux 32-bit: https://cache.saurik.com/impactor/l32/Impactor32_0.9.43.tgz
Linux 64-bit: https://cache.saurik.com/impactor/l64/Impactor64_0.9.43.tgz
Now that you have obtained both versions, you'll start off on 0.9.43. Open up 0.9.43, and revoke certificates (under Xcode menu). Then, open up 0.9.44, and sideload your app to your device. You'll need to use this process to sideload until Saurik updates Cydia Impactor.
I would suggest, if your device supports it (iOS 10 64-bit, jailbroken with yalu, extra_recipe, or g0blin), using Ext3nder Installer by Julio Verne to resign your apps. Cydia Extender 0.9.44 currently does not have a certificate revocation issue. If you currently have Ext3nder or Ext3nder Installer installed, and you're having the maxQuantity error, uninstall and reinstall Ext3nder Installer. If you need help, go to this thread which is also linked at the top of this post.
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Update: added credit