Currently the update process consists of the following steps
1. Download the update
2. Use Windows uninstall to remove previous version
3 Install newly downloaded version.
4. Run and test
If it would, at least, be possible to move the test for previous version of SNP7 (and prompt to uninstall) prior to the lengthy un-Zip process, in order to save having to re-run it after removal of the version being replaced.
Best of all worlds would be to prompt for permission to de-install, and do it as part of the installation program.