I had similar issues when installing V4.1.4 on a shared host with temporary (IP) domain.
e.g. [url=“http://169.99.26.55/~pants/index.php”]http://169.99.26.55/~pants/index.php[/url] (actual details changed, link goes nowhere)
Symptoms
- At install - 'The URL rewrite engine is disabled. Subpath-based storefront URLs will not work' (clicked past and install went ok)
- SEO add-on would not install
I checked with the Host and they said mod_rewrite was definitely installed and that the issue would probably be resolved once my domain name was transferred to them.
So I logged a ticket with CS-Cart help desk who did this in .htaccess
replaced
RewriteBase /
with
RewriteBase /~pants
Now SEO add-on installs ok.
Note - the test suggested by Martfox at Post #15 didn't work before or after.
Hope this helps someone.