I installed ignition 8.1.20 but when i start design launcher it doesn't work
Why? That version is ancient and unsupported.
What i should install
Start here:
It will redirect to the latest actual release.
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That second gateway is on a link-local auto-generated address. It would require you to open ports in or disable the Windows firewall.
Or are you trying to use two gateways in one machine?
Status: INCOMPATIBLE is returned for Ignition 7 gateways, or 'dev' builds.
Consider taking a gateway backup, then uninstalling everything. Make sure the Inductive Automation folder under Program Files is completely gone. Then do a fresh install and commissioning. Then load and test the designer. Then restore the gateway backup and test the designer again.