I found the problem, perhaps due to a misspelling between lines = begin and = end, this is due only to a point out of place, just before = end, in my case, I have many plugins installed and thought it was due to one that caused the conflict, I tried an installation of SU 8 without additional plugins and charge well, it might be the WXP vs windows vista, in windows vista remove the point of the last sentence of the load file header specifically as follows:

original
AND FITNESS FOR A PARTICULAR PURPOSE.
= end
new
AND FITNESS FOR A PARTICULAR PURPOSE
= end

in windows vista files are not loaded when I was at the end point of the line before = end, but in windows xp there was no problem loading the plugin

another thing I did was copy the contents of the folder directly in the plugins folder of SU 8