No payments here on the forums. This is a place for free help, and one of few places for help.
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What is the usual lifecycle of the osCommerce-powered webstore?
Years, so long as you keep it updated to the newer php and sql codes when they come out.
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Usually who installs osCommerce for average Joe
Joe usually starts out trying to install it. Sometimes Joe needs help becuase he is not savvy in these things.
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Where does the average Joe finds this consultant
He has to search around, look at people here and go for recommendations, you cannot request paid help on these forums.
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Does the average user of osCommerce can install custom osCommerce module (with file copying and SQL operations) or is it always outsourced to module developers and consultants?
osCommerce is open source, Everyone has full permission to try anything they want with the code, so long as they honor the GNU open source rules
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When average user of osCommerce has a specific need for a feature - what does he do? Calls a consultant or tries to fix it himself?
Whatever he is more comfortable with. If he had a lot of help before, he will probally contact someone else to do it. If he tried and did succeed with things before, he will probally try to see if he can add the feature himself.
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I can see all these plugins for sale for osCommerce - so how people deal with installation and techsupport after they buy them? Does the plugin maker provide techsupport for installation?
The plugin maker should provide support if he makes it. Always look at their site first to get an idea if they will really stand behind what they make, look for install tips, questions and answers, maybe a forum. Beware the ones that offer the plugin for sale, but show no signs of helping you. Always ask here first if you find a plugin you want to buy but arent sure . Some people may encrypt the plugins they make so that you can not further alter it.
All plugins here, we call contributions, and all are free. Some have very good support topics, others dont. Sometimes you wont get an answer here, more than likely becuase it is a repetative question and the answer can be found with a google search of these forums.