Windowsには評価版があります。これらは無料で180日ほど利用できるものです。ただし、数回（バージョンによる）期限を延長できます。延長方法等はまた別の記事で紹介します。これを繰り返し再インストールを繰り返せば永久に無料かも？（推奨はしません）
以下はWindows各バージョンのリンクです。サポートが終了したものもありますので、ご注意ください。
Windows 11
最新版
Windows 11 Enterprise | Microsoft Evaluation Center
Windows 11 はハイブリッド ワークのために設計されており、生産性、コラボレーション、セキュリティに焦点を当てて機能が強化されています。
www.microsoft.com
24H2
x64
https://software-static.download.prss.microsoft.com/dbazure/888969d5-f34g-4e03-ac9d-1f9786c66749/26100.1742.240906-0331.ge_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-static.download.prss.microsoft.com
ARM64
https://software-static.download.prss.microsoft.com/dbazure/888969d5-f34g-4e03-ac9d-1f9786c66749/26100.1.240331-1435.ge_release_CLIENTENTERPRISEEVAL_OEMRET_A64FRE_en-us.iso
software-static.download.prss.microsoft.com
23H2
https://software-static.download.prss.microsoft.com/dbazure/888969d5-f34g-4e03-ac9d-1f9786c66749/22631.2428.231001-0608.23h2_ni_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-static.download.prss.microsoft.com
22H2
https://software-static.download.prss.microsoft.com/dbazure/988969d5-f34g-4e03-ac9d-1f9786c66751/22621.525.220925-0207.ni_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-static.download.prss.microsoft.com
21H2
https://software-download.microsoft.com/download/pr/22000.194.210913-1444.co_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-download.microsoft.com
Windows 10
22H2
x64
https://software-static.download.prss.microsoft.com/dbazure/988969d5-f34g-4e03-ac9d-1f9786c66750/19045.2006.220908-0225.22h2_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-static.download.prss.microsoft.com
x86
https://software-static.download.prss.microsoft.com/dbazure/988969d5-f34g-4e03-ac9d-1f9786c66750/19045.2006.220908-0225.22h2_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x86FRE_ja-jp.iso
software-static.download.prss.microsoft.com
21H2
x64
https://software-download.microsoft.com/download/pr/19044.1288.211006-0501.21h2_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-download.microsoft.com
x86
https://software-download.microsoft.com/download/pr/19044.1288.211006-0501.21h2_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x86FRE_ja-jp.iso
software-download.microsoft.com
21H1
x64
https://software-download.microsoft.com/download/pr/19043.928.210409-1212.21h1_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-download.microsoft.com
x84
https://software-download.microsoft.com/download/pr/19043.928.210409-1212.21h1_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x86FRE_ja-jp.iso
software-download.microsoft.com
1909
x64
https://software-download.microsoft.com/download/pr/18363.418.191007-0143.19h2_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-download.microsoft.com
x86
https://software-download.microsoft.com/download/pr/18363.418.191007-0143.19h2_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x86FRE_ja-jp.iso
software-download.microsoft.com
1903
x64
https://software-download.microsoft.com/download/pr/18362.30.190401-1528.19h1_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-download.microsoft.com
x86
https://software-download.microsoft.com/download/pr/18362.30.190401-1528.19h1_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x86FRE_ja-jp.iso
software-download.microsoft.com
1809
x64
https://software-download.microsoft.com/download/pr/17763.107.101029-1455.rs5_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x64FRE_ja-jp.iso
software-download.microsoft.com
x86
https://software-download.microsoft.com/download/pr/17763.107.101029-1455.rs5_release_svc_refresh_CLIENTENTERPRISEEVAL_OEMRET_x86FRE_ja-jp.iso
software-download.microsoft.com
Windows 8.1
x64
http://care.dlservice.microsoft.com/dl/download/1/1/4/11432B30-272F-4560-9F3F-DF1A07D3CA98/9600.17050.WINBLUE_REFRESH.140317-1640_X64FRE_ENTERPRISE_EVAL_JA-JP-IR3_CENA_X64FREE_JA-JP_DV9.ISO
care.dlservice.microsoft.com
x86
http://care.dlservice.microsoft.com/dl/download/1/1/4/11432B30-272F-4560-9F3F-DF1A07D3CA98/9600.17050.WINBLUE_REFRESH.140317-1640_X86FRE_ENTERPRISE_EVAL_JA-JP-IR3_CENA_X86FREE_JA-JP_DV9.ISO
care.dlservice.microsoft.com
Windows 7
x64
http://care.dlservice.microsoft.com/dl/download/evalx/win7/x64/JA/7600.16385.090713-1255_x64fre_enterprise_ja-jp_EVAL_Eval_Enterprise-GRMCENXEVAL_JA_DVD.iso
care.dlservice.microsoft.com
x86
http://care.dlservice.microsoft.com/dl/download/evalx/win7/x86/JA/7600.16385.090713-1255_x86fre_enterprise_ja-jp_EVAL_Eval_Enterprise-GRMCENEVAL_JA_DVD.iso
care.dlservice.microsoft.com
