I need some clarification:-
1) You had Presenter 7.0 installed on your system and now you want to install presenter 7.0.7 on same system ?
2) What error message you get when you launch 7.0.7 in trial mode. Please share screenshot
If you have license of Presenter 7.0 then you can use it to serialize presenter 7.0.7. Adobe presenter 7.0.7 is a free upgrade.