I tried to install Hfss v11 in windows 7. I used the compatibility tool to windows XP (sp2) and the installation went smooth. Invalid (inconsistent) license key (FLEXlm Error -8)'. Download the free trial version below to get started. Double-click the downloaded file to install the software.

My problem was solved. If you have this problem,also,you have to do following steps: if your installation is not work,you sure that you have to do '4' and '5' steps only. 1- sure that your installation steps are true. 2- copy/paste 'license file' to 'admin' folder in your installation path. 3- copy/paste 'patch' and 'Ansoftfix.exe' from your HFSS source to installation path.

4 - you have to run 'patch' and 'Ansoftfix.exe' as 'Administrator' only.namely right click on them and set 'Run as Administrator'. You have to first run patch and next run Ansoftfix.exe. 5- if again your installation doesn't work,you have to choice a path instead of 'windows hard disk drive'.for example you have to install your HFSS in 'D' drive instead 'C' drive. Houghton Mifflin Alpha Friends Cda there. Sure that your HFSS will work.