6.79 won’t work for sure as of today.
How were you managing in the old version with 512M limit?
What is your file size?
I found a solution based on what you guys suggested.
We need to downgrade to a previous version.
How to downgrade?
There are two ways:-
1) Using WP Rollback plugin
2) Manually download the old version of plugin and upload it (Go to ww.wp.xz.cn download page from your browser. Click on Advanced View–> Select your version and download.)
Here is a video tutorial https://www.youtube.com/watch?v=oEZlWdO38SQ
I had issues with version 6.78, so I went with version 6.76. It worked for me.
Hope it helps