Force HTTPS for Subfolder

Hello,

I have the following setup.

https://www.mysite.com/
https://www.mysite.com/en/

Two separate WordPress installs. WordPress URL and site url are set to the same as above respectively for both WordPress installs.

I installed your plugin and chose force HTTPS for https://www.mysite.com. This works and redirects old http urls to https.

I also installed your plugin on https://www.mysite.com/en/ but when I go to Site tab and choose force HTTPS, the site url looks like https://www.mysite.com and it doesn’t work of course.

My question is how I can force old http to https in the subfolder? None of the htaccess codes that I found work.

Thanks for your help.