Update WAMP Server plus php version (7 replies)

Hi,
I am sorry to bother but I am "only" a user and not so comfortable with web servers. I was happy when I managed in Feb. 2017 to install WAMP (after I had had troubles with XAMP) for my local Joomla installations. Now that I get the message that my recent php version (7.0.10) will not longer be supported, I need to update. And as I am still running WAMP Version 3.0.8 - 32bit I thought to update that also. I am scared to do so even though I could read that I need not uninstall the old WAMP version when updating to 3.1.4 with the update package. I also don't know if I need to update Apache (recently vers 2.4.23) and MySQL (recently 5.7.14). I don't see if I have MariaDB installed.

I am running Windows 7 64bit but am not sure if I installed WAMP 3.0.8 also for 64 bit.

It would be very much appreciated if I can get some hints, e.g. which files I need to download and what if the update does not work. Can I switch back to the 3.0.8 version which works by copying my backup directory back to the root?

Thank you very much in advance.
Kind regards
Gerda