don_bradman wrote: That's a lot of work.
Not, it isn't. It takes just 1-2 minutes to really do it when knowing what to do. It takes 5-10 minutes to read and do it. And it took more than 30 minutes to write the steps well formatted so that hopefully really everybody can do it.
It is of course easier on using 2 different user accounts as in this case it is possible to install first older version of UltraEdit with advanced option to install UltraEdit only for current user and next install newer UltraEdit with another user account again using advanced option to install only for current user. But in practice using 2 Windows user accounts to have 2 UltraEdit versions installed is not as handy as it is on having both versions available and running parallel, especially on the requirement to test complex regular expressions, macros or scripts in both versions of UltraEdit quickly.
There are even more possibilities to use multiple versions on same machine with same user account. This is just the one which I thought is most useful for your requirements of parallel testing Perl regular expressions and scripts after reading all your forum topics.