I can offer you the following solution: Your features NewFeature1 (A) and NewFeature1 (B) are without any level-condition (!) Both of them are visible and have installLevel=150 (!) RadioGroup Property SELECTFEATURE = 0 RadioA = A RadioB = B you have ISScript - Functions ///////////////////////////////////////////////////////////// // Put this CA after NEXT of Radio-Dialog function SetFeatureCondition(hMSI) NUMBER nBuffer; STRING svProp; begin nBuffer=255; MsiGetProperty(hMSI,"SELECTFEATURE",svProp,nBuffer); if(svProp=="A") then SetFeatureStrCondition(hMSI,"NewFeature1",SW_SHOW); SetFeatureStrCondition(hMSI,"NewFeature2",SW_HIDE); endif; if(svProp=="B") then SetFeatureStrCondition(hMSI,"NewFeature2",SW_SHOW); SetFeatureStrCondition(hMSI,"NewFeature1",SW_HIDE); else endif; end; ///////////////////////////////////////////////////////////// function SetFeatureStrCondition(hMSI,szFeature,nShowHide) NUMBER hDB; NUMBER hView, hRecord; NUMBER nResult, nBuffer; NUMBER nVisible; STRING szName; begin hDB=MsiGetActiveDatabase(hMSI); // open view table MsiDatabaseOpenView(hDB, "SELECT * FROM Feature WHERE Feature='"+szFeature+"'", hView); MsiViewExecute(hView, NULL); MsiViewFetch(hView, hRecord); nBuffer = 255; MsiRecordGetString (hRecord, 1, szName, nBuffer); nVisible = MsiRecordGetInteger(hRecord, 5); //MessageBox("Operating on feature: " + szName, INFORMATION); // löschen nResult = MsiViewModify(hView, 6, hRecord); if(nShowHide==SW_HIDE) then // Set to to HIDDEN nResult=MsiRecordSetInteger(hRecord, 5, 0); // Set LEVEL to 150 nResult=MsiRecordSetInteger(hRecord, 6, 150); else // Set to to SHOW nResult=MsiRecordSetInteger(hRecord, 5, 2);//8); // Set LEVEL to 1 nResult=MsiRecordSetInteger(hRecord, 6, 1); // Set Attributes to 0 //nResult=MsiRecordSetInteger(hRecord, 8, 1); endif; // can only temporarily modify running .msi database nResult = MsiViewModify(hView, MSIMODIFY_INSERT_TEMPORARY, hRecord); MsiCloseHandle(hRecord); MsiViewClose(hView); MsiCloseHandle(hDB); end;         ... View more