I don't think it is possible for you. Impulse patches you to the latest version. You would have to had patched to those version in the past and created an archive file. You could then restore the archive.

e.g.

I have an archieve for 1.11, 1.12 and 1.13 as well as the original patch for 1.05. As such I could uninstall and revert to any of these versions.

However the next time I patch via Impulse I would be at the most up to date version (currently 1.14) available.

Archive files are not 'sharable' as they use the owners Nickname encoded within the Archive as a security feature.

Hmmm... for myself, i have created a archive by using the linux software kdiff3... it is a upgrade from 1.05 to 1.12... only 205 mb... much lower that a full game archive and without any personal information...

Can be what the guy here need but i am not sure if i can give it to him... in some way, the use of impulse for upgrade is a protection against pirate... if i post these little upgrade in a public place like these forum, i think that it is mainly pirate who will enjoy it...

So, maybe your staff can control booster101 is a legit sins user ( he need to give your his serial ) and you can PM me if he is legit... in so case, i will upload the upgrade and PM him the link... once downloaded, i will directly delete it... Is it possible AND legal to work this way?