On June 30th 2026, Hearthstone is ending support for 32-bit devices, as s announced in the Blizzard forums. Due to this switch, Hearthstone Deck Tracker will also no longer work on 32-bit devices from that day onwards.
If you use a modern 64-bit device, you are not affected and Hearthstone and HDT continue working as usual.
The vast majority of devices sold in the last 10 years are 64-bit devices, and as such most users should not be affected.
If you are affected, you will need to switch to a more modern device to continue playing Hearthstone and using HDT. You can save and restore your stats and settings by backing up the %AppData%/HearthstoneDeckTracker folder and copying that to your new device.