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Error with Steam (sec_error_unknown_issuer)

I recently downloaded CrossOver Games, and I downloaded Steam through it with no issue. The problem is, I'm now trying to buy games through Steam, and every time I click the purchase button, the following error appears:

Wine Internet Explorer

store.steampowered.com uses an invalid security certificate.

The certificate is not trusted because the issuer certificate is unknown.

(Error code: sec_error_unknown_issuer)

It gives the "OK" option, and I can click the red x in the corner, but there are no other options. Do I need Internet Explorer in order for this to function? I downloaded regular CrossOver and got IE 6.0 through this, but I couldn't seem to fix the issue. Is anyone else having problems with this? I have a MacBook Pro, by the way, with Intel.

Any help would be greatly appreciated. Thanks.

You can use your regular web browser to log into steampowered.com to make game purchases. The will populate in your steam games list after you complete your purchase. I haven't managed an 'in Steam' purchase yet, but have successfully bought more than 10 games via the web site itself.

Haha right after I left this comment I realized I could do this. Thanks a lot for your help!

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