Is there a way to do SEO without installing the product ?
Of course, SEO is more than just installing a product. Products such as Zoints, NuSEO and vBSEO all offer nice features, some more than others.
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Now I am wondering if I should do it. I read somewhere that if you install it there is no clear way to get rid of the hack.
The problem with mods that rewrite urls is that when you uninstall them, you will lose alot (if not all) your search engine traffic.
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Also I think VBSEO requires a link to their site at the bottom of every page : this I don't like since I paid about $150 for the hack.
Thats correct, vbSEO doesn't have a branding free option however as nexialys said Zoints is branding free and NuSEO also have a branding free option (I'm not sure abou DCSEO yet).