If UAC is disabled - no such freezes happen.
HW: Lenovo ThinkPad W500 (8Gb, 256Gb SSD, 1920x1200 display) running Windows 10 Insider TH1 Pro 10240.
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Lars,
UAC works at my side. Windows 10 Enterprise build 10240.
There is no issues installing/running apps when enable/disable UAC settings.
The issue here might be specific, so please report this using the feedback tool, and create a new user account and check to see if the mentioned issue insists.
Regards