[تم الحل] Updating crashes website

Background of the issue:
I am trying to update WPML on my website, but I constantly face problems. I have stopped updating it, and now the outdated version is starting to break my site. The issue can be seen on this page: الرابط المخفي.

Symptoms:
Update failed: Bad gateway The web server reported a bad gateway error. Ray ID: 94228d9509b9bfdb Your IP address: 104.251.240.89 Error reference number: 502 Cloudflare Location: Atlanta.

Questions:
Why does updating WPML crash my website?
How can I successfully update WPML without errors?