What is the zip file size? What permissions are set for your Upgrades folder?
can you run following command to update the permissions for upgrades folder.
chmod -R 755 upgrades
if 755 does not resolve, make it 777 to be sure if its a permissions issue.
When you go to Admin -> Module Loader and upload the package, is it shown in the Upload area or that does not show the Ready to be installed package?
Can you check server error_log for PHP errors? Is there anything in SuiteCRM Log?
I had the same problem with installing the Dutch Language Pack. I could upload it, and it showed in the list, but when I hit the Install button it didn’t show the next page with the Commit button.
It turned out that the PHP setting was 7.4, I changed it back to 7.3 and it all worked.