Toad for DB2 installer disappeared after clicking next button.
VB script runtime is not installed on the target computer.
Resolution #1:
Install vb script runtime
Resolution #2 :
Perform a silent install
1. Copy Toad installer to a local drive
2. Open command window and cd to the folder where the installation file resides
3. Run the following command: "Toad.exe" /S /L*v ToadInstallerLog.txt
e.g. Toad for DB2 Trial_3.0.1.1077.exe
This command will install Toad quietly ( without UI) with logging turned on, if installation fails again, please send ToadInstallerLog.txt for debugging.