Today I tried several times to install tcmd 21 under Win7 or Win2012R2. Antivirus was disabled and direct internet access was granted. The server has been rebooted prior to the installation. After unpacking the files the installation stopped while displaying "wait until the installer prepares for installation" (rough translation of the german text) or did not get even so far. Trying older Versions: tcmd 17 and 18 could be installed without any problem. Tcmd 19 had the same problem as 21. What is going wrong ? What are the complete prerequisites for a successfull installation ?