It took over 24 hours, but I managed to get Windows 10 on an ancient Acer Aspire 7720 : r/Windows10
Short Review Acer Aspire 7720G Notebook - NotebookCheck.net Reviews
Acer Aspire 7720G Notebook: Breve Recensione - Notebookcheck.it
Scheda tecnica del prodotto Acer Aspire 7720G-934G64BN T9300 43,2 cm (17") Intel® Core™2 Duo 4 GB DDR2-SDRAM 320 GB NVIDIA® GeForce® 8600M GT Windows Vista Home Premium Notebook (LX.ANS0X.407)