After quite a long while I got a working w32 development enviroment again and thus built the transputty patch against the new 0.60 version of putty with mingw. So if someone still uses the old crude pseudotransparency of transputty, it is now possible to upgrade from 0.57 to 0.60 from the same url at http://www.cs.helsinki.fi/u/mxkoskin/