PBE Client not working

Ok. When I try to open the pbe client on my pc the old legacy client pops up telling me to update to the newer one. The "Launch" button found at the top of the legacy client is also absent. If I click the link its showing me it sends me to the normal League download (which i alrady have donwloaded). I have found no way to work around this, even reinstalling does not work and I have had this problem on multiple computers. Could anybody tell me how to fix this problem?
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