I have Internet security on my laptop and want to share it with a new PC. Should be easy. No. I have emailed the license file to the PC and tried to open it. I have copied it to a flash drive and tried to open it on the PC. There must be a simple way to do this.
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One, I'm not sure what you mean by "I have Internet security on my laptop and want to share it with a new PC" ?
1. If you mean switch it from an old system to a new system that shouldn't be a problem.
2. If you mean actually share one license on two systems that can't be done unless you have purchased a multi PC license.
I will work on item 1. uninstall avast on the old system, install avast on the new system.
Connect your new installation to your my.avast.com account, open the devices, if the old installation is still there delete it. This will allow you to assign the license to the new system.
If it is a multi PC license, then you should be able to assign the license from your my.avast.com account.