You can download a copy on piratebay.org and use your own COA with it. If you want all the features to work be sure to download Windows XP Tablet Edition. Also don't get greedy and try upgrading to a newer service pack than what you have a license for. Your COA won't work with a newer revision.
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Here is a stylus for the m275 for $21.00
https://www.dvmmgr.com/OnlineStore/store/comersus_viewItem.asp? idProduct=57
You can download a copy on piratebay.org and use your own COA with it. If you want all the features to work be sure to download Windows XP Tablet Edition. Also don't get greedy and try upgrading to a newer service pack than what you have a license for. Your COA won't work with a newer revision.