If you remove this code does name shows?
Can you please give me a screenshot of the code where you added?
To show GMT+-X please add that after GMT in the code above.
Group and announcement emails are send using cron, So it may possible after changing that value cron was reset and start sending emails. I have seen this behavior before with some of my users.
I am very so for the issue and late reply.
You will need to download latest version to latest license key to work.
You can download from the link in your email or login in https://www.shamimsplugins.com/account/ and download from there.
Then use your license key.