Upgrade all deprecated codes

[shamsbd71]

Steps to reproduce the issue

Install Digicom on latest joomla 3.x, Enable debugging, Set Error reporting to max or development.

Expected result

No PHP warning

Actual result

Lots of PHP warnings

System information (as much as possible)

Additional comments

[pronob1010]

• No deprecated issue was found for PHP@7.4.
• No downloading issue.