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 R4313
14 May 2026
Minor plane-related fixes and improvements (#1340)
Ultimate Doom Builder R4312
14 May 2026
Ignore Build folder (#1337)
Ultimate Doom Builder R4311
25 Apr 2026
Added ELFBSP 1.2 to both Windows and Linux builds (#1323)
Ultimate Doom Builder R4310
25 Apr 2026
Added UDMF properties for Eternity wall scaling and wrapmidtex (#1324)
Ultimate Doom Builder R4309
25 Apr 2026
Add missing REJECT Explorer Mode to installer