I have just tried to upgrade two very different iMacs from Yosemite to El Capitan. Both hang at 95% & I am wondering if the common factor is having SAV onboard, as I read a posting just where someone had an inactive Kaspersky AV programme on his Mac, & ran into exactly the same problems, managed to finally get El Cap installed but then continued with problems until he totally removed the AV
Here is the post:
Anybody else run into this problem?
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