To make binary installer:

Compile DetexGUI into bin\Release
Copy detex.dll into bin\Release
Expand detex-2.7 into detex\detex-2.7\*

Run:

makensis.bat

To make source installer:

Compile DetexGUI into bin\Release (for config.xml)
detex_dll/ must be at the same level as DetexGUI/

Run:

perl makesrc.pl