403 Forbidden isn’t a typical error that I’m used to people reporting. Unfortunately it doesn’t immediately suggest a particular issue.
First off, make sure you reset your browser cache after any upgrade.
Reset Permissions
osTicket Awesome uses standard permissions.
All folders should be 755 (drwxr-xr-x) and all files should be 644 (-rw-r–r–).
If you suspect that your permissions are messed up you can easily reset them.
For directories
# find . -type d -print0 | xargs -0 chmod 0755
For files
# find . -type f -print0 | xargs -0 chmod 0644
Check Error Logs
Error 403 is a generic message. When you see that error in your web browser, the actual error message has been recorded in your Apache logs. (If you don’t know how to find your Apache logs, ask your web host).
Look for the error that occurs at the exact time that you try to load the page.
Once you find the actual error, feel free to post it here (although you may want to redact any IP addresses or confidential server information)..