Hi Dariusz,
Yes the application itself is not so big, but if you make a VB deployment you get VB Runtime + some other necessary stuff for free (which causes the problems you encounter, since it probably tries to upgrade oleaut32.dll and some more COM related stuff).
If you have the latest VB6 version installed (probably not, otherwise setup would not have tried to upgrade your machine I suppose), I can give you the smaller version (which is only a few 100K in size).
Regards,
Rudolf
#webMethods#API-Management#Tamino