Cant install Opt-In Free 5.7 on Concrete5

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Hi I am currently running one website with C5 version 5.7.5.9 and also one with a earlier version Concrete5 version 5.7.5.6. I made several attempts to install your add-on "Opt-In Free 5.7" but it would not allow me to install returning a version incompatibility error.
*** Please See Attachment ***

One of the websites uses the STUCCO theme (C5 - v 5.7.5.9), and and the other one uses a parallax theme "Long Story Short - Paid version" (C5 - v 5.7.5.9) and it would not install on either one of them. Thank you.

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Type: Pre-Sale
Status: In Progress
maddox
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ConcreteConversion replied on at Permalink Reply
ConcreteConversion
Hello, I'm sorry to say, but Opt-In is not supported on the latest C5 versions. The reason is that there were so many breaking changes for every version update, that eventually it wasn't worth the time trying to keep up.

That's a problem with C5, it works fine if you don't scratch the surface, but when you're trying to do something moderately advanced, it's a pain. Still it's better than most other CMS's...
maddox replied on at Permalink Reply
maddox
Got it. It's too bad, it does seem like a very useful add-on. Thank you for your reply.
maddox replied on at Permalink Reply
maddox
Got it. It's too bad, it does seem like a very useful add-on. Thank you for your reply.

concrete5 Environment Information

Current environment
# concrete5 Version
Core Version - 5.7.5.6
Version Installed - 5.7.5.6

and

# concrete5 Version
Core Version - 5.7.5.9
Version Installed - 5.7.5.9

Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.101 Safari/537.36 OPR/40.0.2308.62

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