If you're stuck in InstallShield offline activation, and want to revert to online activation, simply remove the value HKEY_CURRENT_USER\Software\InstallShield\xx.0\OfflineTransactionPending from registry.

Remember to replace xx with your actual InstallShield version number.

Refer to InstallShield Release Table to find the product version from release name.

Or run the following command as administrator:

reg delete HKEY_CURRENT_USER\Software\InstallShield\xx.0 /v OfflineTransactionPending /f

Reference: Offline Activation Fails