I know it is closing the barn door after the cows have already gotten out but you did not make a copy of the htacess file before you changed it? Is there some way you can ask a friend or someone else through your domain host for a copy of an unedited htaccess file? It is only a small text file and you may find a sympathetic ear if you only ask them for a copy of one file to get it back to normal. Do you have backup copies of your files for your webpages? I don’t know if you can get it but it seems it would be easy for them to get the information for you and that way you do not have to ask for support about a third party app.
Hope it helps.
Ward
