When we update plugin lost our custome code

Our problem is after updating the event calender plugin we lost our custom code:

We use the 3 event plugins
1)the-events-calendar
2)event-tickets
3)events-calendar-pro

We modeify the files from the event calendar plugin and event tickets plugin
so how we set that modified files in our theam folder

The following files are we modified
1)public_html/wp-content/plugins/the-events-calendar/src/Tribe/Main.php
2)public_html/wp-content/plugins/event-tickets/src/Tribe/Attendees_Table.php
3)public_html/wp-content/plugins/event-tickets/src/admin-views/attendees.php
4)public_html/wp-content/plugins/event-tickets/src/views/tickets/email.php

So how we include this files into our theam so when the plugin is updated our code is not lost.

Now we try to include the files as follows but its not working…
we include the files in our theam as following way
we made a folder called “tribe-events” and to include main.php in following path

public_html/wp-content/themes/mantra 2.4.0/tribe-events/src/Tribe/Main.php

but our changes is not refflected ..
so please give me the solution to how i add that files in theam so it reflect in plugin

https://ww.wp.xz.cn/plugins/the-events-calendar/