Google Sheets script executes outdated version. How can I get the sheet to load the latest script?

Google Sheets script executes outdated version. How can I get the sheet to
load the latest script?

References

Reference NO 1

http://stackoverflow.com/questions/15191773/google-sheets-script-executes-outdated-version-how-can-i-get-the-sheet-to-load

Reference NO 2

https://developers.google.com/apps-script/reference/spreadsheet/spreadsheet-app

Reference NO 3

https://developers.google.com/apps-script/understanding_triggers

Reference NO 4

http://productforums.google.com/d/topic/docs/Yyz02yXOSRQ

Reference NO 5

http://productforums.google.com/d/topic/docs/5bhZy43NF2s

Reference NO 6

http://mashe.hawksey.info/2011/10/google-spreadsheets-as-a-database-insert-with-apps-script-form-postget-submit-method/

Reference NO 7

http://www.javascript-spreadsheet-programming.com/

Reference NO 8

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