I am unable to upgrade. I download the file and try to install it and get an error that I already have a newer edition. The installed edition is 2.50. I uninstalled 2.50 and now I cannot install 2.53 I get an error that I do not have permission to access Calibre2 folder in Program Files. I have taken ownership of Program Files and Calibre2 folder but still cannot do anything. I have given myself permission to access it but cannot access it. I created a new folder Calibre2Library in Program files but I cannot install to it either. Help. Thanks.
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