First of all, I discourage using current MeeShopGUI version, it's very obsolete and bugged by now - developer is currently working on completely new, fresh one.
One option is Warehouse, it works if you install TLS 1.2 patch, or use proxied version (somewhere on my group, I may upload here if needed).
Second is my old MeeShop (saying as a developer, very badly written), which still somewhat works fine, but it's basic. Warehouse has a problem with Aegis, it may not install many of apps, MeeShop hasn't got this problem, but Warehouse has awesome interface and big database.