It took over 24 hours, but I managed to get Windows 10 on an ancient Acer Aspire 7720 : r/Windows10
Acer Aspire 7720G Review | Trusted Reviews
Acer Aspire 7720-6827 Notebook PC - Intel Core 2 Duo T5550 1.83GHz, 802.11a/b/g WLAN, 3GB DDR2, 320GB HDD, Blu-Ray/DVDRW, 17 WXGA+, Integrated Webcam, Windows Vista Home Premium at TigerDirect.com
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Acer Aspire 7720-6569 Laptop Computer - Intel Core 2 Duo T5450 1.66GHz, 802.11a/b/g Wireless, 2GB DDR2, 160GB HDD, DL DVDRW, 17 WXGA+, Integrated Webcam, Windows Vista Home Premium at TigerDirect.com