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Have a look on eBay; there is a guy in Melbourne who will 3d print you one & mail it to you for between $12 - $16 depending on what size you need.
Or, you can get one through an astro shop for about $30 - $40... the ebay one is good, he made me one for an 8" SCT recently & I echo Ryan's comment, very simple to use & makes for perfect focus...
What problems are you having downloading Sharpcap?
I downloaded it recently with no problems at all, Windows 10 64bit...
Cheers
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