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SeniorTaquito I'd do it by finding the legit checksum information of your language version, on some trustworthy website, then download the ISO file anywhere and compare the checksums to ensure the file hasn't been tempered with. I don't have neither anymore so can't provide you with first-hand information. Make sure to pull any LAN cables or Windows would auto-update itself, effectively losing the eye strain benefits.
Should a user decide to "get" LTSB 2015, the procedure is similar, although probably not authorized by any means, plus it would involve bypassing software activation. So probably not something we can discuss in detail here. I think the forum mydigitallife.info is a good source of information.