Your firewall settings might block the launcher, preventing updates from happening properly, etc.
Follow these steps to fix this issue:
Step 1: Type "Firewall" into the search bar and click to open it.
Step 2: Select "Advanced Settings."
Step 3: Choose "incoming connections" > "new rule."
Step 4: Click "program" then proceed with "forward."
Step 5: Select "program path" and thereafter "browse."
Step 6: Navigate to the Aion folder, find the EuroAion Launcher, open it, and then click "forward."
Step 7: Select "allow connection" and then continue with "forward."
Step 8: Check all options and proceed by pressing "forward."
Final Step: Type any desired name and hit "forward."
Repeat these steps for "outgoing connections" starting from Step 3, and you're all set.
If after this, updates from the launcher are still not working, take a look at your Antivirus or Modem Firewall settings.
For a seamless experience without these firewall hassles, you should try out the upcoming Aion Riftshade server. It launches in Q1 2026 and offers integrated security features designed to let you enjoy Aion 4.8 effortlessly, without dealing with annoying connection issues.