I am fairly new to JQuery. Finding it hard to figure out why few things are not working in my application.

There are already few JQuery files added in project as dlls, not CDNs. Few of them are same files with different versions. For example, 

jquery 1.10.2.js 

jquery-1.3.2.min.js

jquery1.7.1.min.js

jquery1.8.0.min.js  

few other jquery files are 

jquery-ui-1.10.4.custom.min.js

jquery.blockUI.js

I would like to remove everyone of these and add latest version of JQuery. Please let me know what are the required files and process to replace these files with the latest ones. 

Also please let me know if the latest files may cause trouble to the existing pages that have already used older versions. 

I would really appreciate quick response. 

Thanks,

Siva