I'm installing Multisite for a fair-sized business, who's WordPress website has been running for around 5 years.
When trying to install it, I am receiving the following warning message:
"Because your installation is not new, the sites in your WordPress network must use sub-domains. The main site in a sub-directory installation will need to use a modified permalink structure, potentially breaking existing links."
Sub-domains are not an option for us. The main site is mysite.co.uk, and the websites will be mysite.com/fr, mysite.com/pt, etc.
What are my options?
Is there any way around this without causing serious SEO/Google issues, which is what I assume the warning refers to?