[image] I'm getting this Error trying to open a designer, I have checked the windows security and there is nothing being blocked. I have also tried deleting the Cache folder contents. Any suggestions what can be done next?

Hi @farjam_haghighi , I think this would help you [image] Launch client jar invalid Ignition 8.3 Early Access Testing Ignition 8.3.0 Beta. I had to upgrade my Designer Launcher to 1.3.0 Beta-1 to access the 8.3 designer. However, I'm now unable to open any o…

Launch Client Jar Invalid Error

Ignition

Arnaud_Declerck June 16, 2026, 5:43am 2

Hi @farjam_haghighi ,

I think this would help you

Regards

Arnaud