URLs with %% breaking and throwing 404

Hi guys,

I’ve got wordpress installed in the root folder of a website.
Then in a sub directory l’ve got a software installed called CPVLab.

CPVLab requires that l’m able to use %%’s in my URL. example:
https://www.mydomain.com/cpvlab/base.php?c=15&key=a99ce3a85cd3c89f545683f0470955e9&keyword=%%KEYWORD%%

However the %%KEYWORD%% part breaks, and WP throws a 404 error. I know it’s a problem with the %%KEYWORD%% part because if l cahnge it to:
https://www.mydomain.com/cpvlab/base.php?c=15&key=a99ce3a85cd3c89f545683f0470955e9&keyword=TEST

The URL works just fine…

Can anyone help me out with how l can get around this? Is it an .htaccess rule l need to fix, or something? Any help would be greatly appreciated.

Thanks,