No wampserver.exe is not relivant in this situation.
Ok I always find this difficult to describe so bear with me here.
The problem when switching between versions of Apache and PHP is that you can only switch one at a time i.e. you can switch Apache and then when thats done you can switch PHP or visa versa.
Now if you have a compatible Apache-PHP pair and try to switch down to an old PHP compiled with a different compiler Apache wont start properly using the newly switched to PHP, and visa versa if you switch the Apache first to an old Apache it wont run with the newer PHP.
One solution is to step backward from where you are to where you want to be, using an intermediate version of Apache and/or PHP so you can get to your desired destination through one or more intermediate versions of both Apache and PHP. This can envolve more than one (unnecessary version of both Apache and PHP)
However it does work as I have done this myself.
Alternatively, you switch either Apache or PHP to an incompatible version, ignore the error in startup and then switch the other version of either Apache or PHP. This should work, and will keep all the WAMPServer config files in step.
The new 2.5 switching mechanism has some extra checks in the switching process and you may get a command window thrown at you saying it has cancelled the switch due to incompatibilities. In this case you will probably have to install an intermediate version of either Apache or PHP.
You may also get a crash message from wampmanager, which I ignore and just continue the process with my fingers crossed.
I hope this is of some assistance.
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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>Read The Manuals Apache --
MySQL --
PHP --
phpMyAdminGet your Apache/MySQL/mariaDB/PHP ADDONs here from the
WAMPServer alternate Repo-X-X-X-
Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-