I managed to finally get the game to fully install after trying a couple suggestions in conjunction with each other.
The steps that worked for me was as follows:
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Make sure auto-update is disabled on your Battle.net launcher
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Close any process related to Steam and Discord
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Temporarily disable anti-virus/malware (in my case I disabled Kaspersky)
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Restart the Battle.net launcher after you have done these 3 things
I had tried all of these things individually, which did not work, but I was finally able to install after doing all 3 together. Hope this helps.
Thanks to Angelluus and Gelebor for giving me the idea to close Steam and Discord