I am trying to access Magento Connect Manager it is not opening, it is showing blank page. What am I supposed to do?
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in the worst case, if you want immediate solution , Alternatively you can install the extension through FTP (like FileZilla). You can paste the extension key in this unofficial link and you can download the extension files. Let me know if you find any problems in this.
Note : As this is unofficial 3rd party site, there is no guarantee about security. but i tested many extensions, i did't faced any security problems....