Note: Unless you are using a severely outdated operating system or CPU, you most likely want to always download the x64 (64-bit) version of Ultimate Doom Builder.
The 64-bit version has less limitations on the total size of the project that you can load and edit, while the x86 (32-bit) version of Ultimate Doom Builder only exists for compatibility with older PCs.
If not sure, follow these instructions to find out whether your system is 64-bit: Which version of Windows operating system am I running?
The 64-bit version has less limitations on the total size of the project that you can load and edit, while the x86 (32-bit) version of Ultimate Doom Builder only exists for compatibility with older PCs.
If not sure, follow these instructions to find out whether your system is 64-bit: Which version of Windows operating system am I running?
All recent versions
Ultimate Doom Builder R4298
18 Feb 2026
Add possibility to multiselect thing types in Find/Replace window. (#1288)
Ultimate Doom Builder R4297
18 Feb 2026
More fixes to Flatpak build action
Ultimate Doom Builder R4296
18 Feb 2026
Fixes to Flatpak build action
Ultimate Doom Builder R4295
18 Feb 2026
Fixed an issue where the Decorate include directive did not work correctly when trying to include files with less than 9 characters and no extension. Fixes #1292
Ultimate Doom Builder R4292
07 Feb 2026
ZScript: added support for norollback keyword (#1302)